Editing Snoring

{{Short description|Vibratory sound made while asleep}}
{{merge from|Stertor|discuss=Talk:Stertor#Merge_to_Snoring,_Respiratory_sounds,_or_stridor_?|date=March 2025}}
{{Redirect|Snore}}
{{For|the villages in Norfolk, England|Little Snoring|Great Snoring}}
{{pp-pc1|small=yes}}
{{cs1 config |name-list-style=vanc}}
{{Infobox medical condition (new)
| name            = Snoring
| synonyms        = 
| image           = File:Obstruction ventilation apnée sommeil.svg
| caption         = The soft palate and the base of tongue obstruct the airway in a person sleeping on their back. Snoring is one of the major symptoms of [[obstructive sleep apnea]], although it may occur without any sleep apnea or other medical conditions.
| pronounce       = 
| field           = [[Otorhinolaryngology]], [[sleep medicine]]
| symptoms        = 
| complications   = 
| onset           = 
| duration        = 
| types           = 
| causes          = 
| risks           = 
| diagnosis       = 
| differential    = 
| prevention      = 
| treatment       = 
| medication      = 
| prognosis       = 
| frequency       = 
| deaths          = 
}}
'''Snoring''' is an abnormal [[respiratory sounds|breath sound]] caused by partially obstructed, turbulent airflow and vibration of tissues in the [[upper respiratory tract]] (e.g., [[uvula]], [[soft palate]], base of [[tongue]]) which occurs during [[sleep]]. It usually happens during [[inhalation]]s (breathing in). 

'''Primary snoring''' is snoring without any associated [[sleep disorder]]s and usually without any serious health effects. It is usually defined as [[apnea–hypopnea index]] score or [[respiratory disturbance index]] score less than 5 events per hour (as diagnosed with [[polysomnography]] or home sleep apnea test) and lack of [[Excessive daytime sleepiness|daytime sleepiness]]. 

Snoring may also be a symptom of [[upper airway resistance syndrome]] or [[obstructive sleep apnea]] ('''apneic snoring'''). In obstructive sleep apnea, snoring occurs in combination with breath holding, gasping, or choking.
{{TOC limit|2}}
==Classification==
In the [[International Classification of Sleep Disorders]] third edition (ICSD-3), snoring is listed under "Isolated symptoms and normal variants" in the section "[[Sleep_and_breathing#Sleep-disordered_breathing_(abnormal_sleep_and_breathing_or_sleep-related_breathing_disorders)|Sleep-related breathing disorders]]". The manual defines snoring as "a respiratory sound generated in the upper airway during sleep that typically occurs during inspiration but may also occur in expiration."<ref name="ICSD-3" />

'''Primary snoring''' (also termed '''simple snoring''', '''non-apneic snoring''', or '''isolated snoring''') is snoring without any other associated medical condition.<ref name="DeMeyer2019">{{cite journal |last1=De Meyer |first1=MMD |last2=Jacquet |first2=W |last3=Vanderveken |first3=OM |last4=Marks |first4=LAM |title=Systematic review of the different aspects of primary snoring. |journal=Sleep Medicine Reviews |date=June 2019 |volume=45 |pages=88–94 |doi=10.1016/j.smrv.2019.03.001 |pmid=30978609|url=https://repository.uantwerpen.be/docman/irua/57f58d/160283_2019_09_07.pdf }}</ref><ref name="ICSD-3">{{cite book |editor1-last=Sateia |editor1-first=M |title=International Classification of Sleep Disorders |date=2014 |publisher=American Academy of Sleep Medicine |isbn=978-0-9915434-1-0 |pages=139–140 |edition=3rd |language=en}}</ref> Primary snoring is not associated with episodes of [[sleep apnea]] (cessation of breathing), [[hypopnea]], [[respiratory-effort related arousal]]s, or [[hypoventilation]].<ref name="ICSD-3" /> Traditionally, primary snoring is considered as benign<ref name="Biggs2014" /> and having no significant health effects for the individual.<ref name="DeMeyer2019" /><ref name="ICSD-3" /> However, the idea that primary snoring without sleep apnea has no negative health effects is being increasingly challenged,<ref name="Yaremchuk2020" /><ref name="Chawla2015" /><ref name="Huang2023" /><ref name="Ramar2015">{{cite journal |last1=Ramar |first1=K |last2=Dort |first2=LC |last3=Katz |first3=SG |last4=Lettieri |first4=CJ |last5=Harrod |first5=CG |last6=Thomas |first6=SM |last7=Chervin |first7=RD |title=Clinical Practice Guideline for the Treatment of Obstructive Sleep Apnea and Snoring with Oral Appliance Therapy: An Update for 2015. |journal=Journal of Clinical Sleep Medicine |date=15 July 2015 |volume=11 |issue=7 |pages=773–827 |doi=10.5664/jcsm.4858 |pmid=26094920 |pmc=4481062}}</ref> especially primary snoring in children.<ref name="Biggs2014">{{cite journal |last1=Biggs |first1=SN |last2=Nixon |first2=GM |last3=Horne |first3=RS |title=The conundrum of primary snoring in children: what are we missing in regards to cognitive and behavioural morbidity? |journal=Sleep Medicine Reviews |date=December 2014 |volume=18 |issue=6 |pages=463–75 |doi=10.1016/j.smrv.2014.06.009 |pmid=25060969}}</ref> For example, there is evidence that primary snoring causes [[excessive daytime sleepiness]],<ref name="Huang2023" /> and it may be linked with several other medical problems, some of which are serious. Even so, it is generally accepted that primary snoring cannot be diagnosed in the presence of sleep apnea.<ref name="ICSD-3" /> 

Snoring is one of the main symptoms of obstructive sleep apnea, in which case it is '''apneic snoring'''.<ref name="ICSD-3" /> In obstructive sleep apnea, snoring occurs in combination with other features such as breath holding (breathing cessation), gasping, or choking.<ref name="ICSD-3" /> There are also other features like daytime sleepiness, nonrestorative sleep, fatigue, or [[insomnia]].<ref name="ICSD-3" />

Snoring has also been classified according to frequency as '''occasional snoring''' (occurring on three nights or less per week) and '''habitual snoring''' (occurring on most nights; synonymous with primary snoring).<ref name="Chang2023">{{cite journal |last1=Chang |first1=JL |last2=Goldberg |first2=AN |last3=Alt |first3=JA |last4=Mohammed |first4=A |last5=Ashbrook |first5=L |last6=Auckley |first6=D |last7=Ayappa |first7=I |last8=Bakhtiar |first8=H |last9=Barrera |first9=JE |last10=Bartley |first10=BL |last11=Billings |first11=ME |last12=Boon |first12=MS |last13=Bosschieter |first13=P |last14=Braverman |first14=I |last15=Brodie |first15=K |last16=Cabrera-Muffly |first16=C |last17=Caesar |first17=R |last18=Cahali |first18=MB |last19=Cai |first19=Y |last20=Cao |first20=M |last21=Capasso |first21=R |last22=Caples |first22=SM |last23=Chahine |first23=LM |last24=Chang |first24=CP |last25=Chang |first25=KW |last26=Chaudhary |first26=N |last27=Cheong |first27=CSJ |last28=Chowdhuri |first28=S |last29=Cistulli |first29=PA |last30=Claman |first30=D |last31=Collen |first31=J |last32=Coughlin |first32=KC |last33=Creamer |first33=J |last34=Davis |first34=EM |last35=Dupuy-McCauley |first35=KL |last36=Durr |first36=ML |last37=Dutt |first37=M |last38=Ali |first38=ME |last39=Elkassabany |first39=NM |last40=Epstein |first40=LJ |last41=Fiala |first41=JA |last42=Freedman |first42=N |last43=Gill |first43=K |last44=Gillespie |first44=MB |last45=Golisch |first45=L |last46=Gooneratne |first46=N |last47=Gottlieb |first47=DJ |last48=Green |first48=KK |last49=Gulati |first49=A |last50=Gurubhagavatula |first50=I |last51=Hayward |first51=N |last52=Hoff |first52=PT |last53=Hoffmann |first53=OMG |last54=Holfinger |first54=SJ |last55=Hsia |first55=J |last56=Huntley |first56=C |last57=Huoh |first57=KC |last58=Huyett |first58=P |last59=Inala |first59=S |last60=Ishman |first60=SL |last61=Jella |first61=TK |last62=Jobanputra |first62=AM |last63=Johnson |first63=AP |last64=Junna |first64=MR |last65=Kado |first65=JT |last66=Kaffenberger |first66=TM |last67=Kapur |first67=VK |last68=Kezirian |first68=EJ |last69=Khan |first69=M |last70=Kirsch |first70=DB |last71=Kominsky |first71=A |last72=Kryger |first72=M |last73=Krystal |first73=AD |last74=Kushida |first74=CA |last75=Kuzniar |first75=TJ |last76=Lam |first76=DJ |last77=Lettieri |first77=CJ |last78=Lim |first78=DC |last79=Lin |first79=HC |last80=Liu |first80=SYC |last81=MacKay |first81=SG |last82=Magalang |first82=UJ |last83=Malhotra |first83=A |last84=Mansukhani |first84=MP |last85=Maurer |first85=JT |last86=May |first86=AM |last87=Mitchell |first87=RB |last88=Mokhlesi |first88=B |last89=Mullins |first89=AE |last90=Nada |first90=EM |last91=Naik |first91=S |last92=Nokes |first92=B |last93=Olson |first93=MD |last94=Pack |first94=AI |last95=Pang |first95=EB |last96=Pang |first96=KP |last97=Patil |first97=SP |last98=Van de Perck |first98=E |last99=Piccirillo |first99=JF |display-authors=1 |last100=Pien |first100=GW |last101=Piper |first101=AJ |last102=Plawecki |first102=A |last103=Quigg |first103=M |last104=Ravesloot |first104=MJL |last105=Redline |first105=S |last106=Rotenberg |first106=BW |last107=Ryden |first107=A |last108=Sarmiento |first108=KF |last109=Sbeih |first109=F |last110=Schell |first110=AE |last111=Schmickl |first111=CN |last112=Schotland |first112=HM |last113=Schwab |first113=RJ |last114=Seo |first114=J |last115=Shah |first115=N |last116=Shelgikar |first116=AV |last117=Shochat |first117=I |last118=Soose |first118=RJ |last119=Steele |first119=TO |last120=Stephens |first120=E |last121=Stepnowsky |first121=C |last122=Strohl |first122=KP |last123=Sutherland |first123=K |last124=Suurna |first124=MV |last125=Thaler |first125=E |last126=Thapa |first126=S |last127=Vanderveken |first127=OM |last128=de Vries |first128=N |last129=Weaver |first129=EM |last130=Weir |first130=ID |last131=Wolfe |first131=LF |last132=Woodson |first132=BT |last133=Won |first133=CHJ |last134=Xu |first134=J |last135=Yalamanchi |first135=P |last136=Yaremchuk |first136=K |last137=Yeghiazarians |first137=Y |last138=Yu |first138=JL |last139=Zeidler |first139=M |last140=Rosen |first140=IM |title=International Consensus Statement on Obstructive Sleep Apnea. |journal=International Forum of Allergy & Rhinology |date=July 2023 |volume=13 |issue=7 |pages=1061–1482 |doi=10.1002/alr.23079 |pmid=36068685 |pmc=10359192}}</ref> 

Snoring has been classified according to [[apnea–hypopnea index]] score and severity of associated [[sleep disorder]]s. Therefore, snoring as a symptom exists as a spectrum of severity, with primary snoring being the least severe, snoring with [[upper airway resistance syndrome]] being of intermediate severity, and snoring associated with obstructive sleep apnea being the most medically significant.<ref name="DeMeyer2019" /> This spectrum of conditions represents increasing degrees of airway obstruction and severity and frequency of disruption of breathing during sleep.<ref name="Biggs2014" />

Obstructive sleep apnea may be subdivided into mild, moderate, and severe types.<ref name="Yap2022" /> 

* Asymptomatic, non-apneic snoring (primary snoring). No daytime sleepiness and apnea–hypopnea index less than 5 per hour.
* Non-apneic snoring with upper airway resistance syndrome. Daytime sleepiness present. Apnea–hypopnea index less than 5 per hour. Between 5 and 10 respiratory-effort-related arousals per hour. [[Oxygen saturation]] more than 90%.
* Apneic snoring (snoring associated with obstructive sleep apnea). Apnea–hypopnea index more than 5 per hour. Oxygen saturation less than 90%. Deviating pattern on [[electroencephalogram]].

Primary snoring is occasionally defined as apnea-hypopnea less than 15 (or less than 10) with [[body mass index]] less than 32 kg/m<sup>2</sup>. It has been suggested that individuals with primary snoring may gradually progress towards obstructive sleep apnea<ref name="Huang2023" /> as causative factors such as aging and obesity change over time. However, there is limited evidence for this. 37% of children with primary snoring progressed to obstructive sleep apnea after 4 years.<ref name="Huang2023" /> On the other hand, in many cases snoring is resolved over time rather than getting worse.<ref name="DeMeyer2019" />

Snoring severity has also been classified according to average maximum volume:<ref name="Yaremchuk2020" />

* Mild (40-50 [[Decibel|decibels]]). Roughly equivalent to quiet conversation.
* Moderate (50–60 dB). Roughly equivalent to a car driving past at low speed.
* Severe (>60 dB). Roughly equivalent to busy traffic or a vacuum cleaner.

In snoring associated with obstructive sleep apnea, louder snoring is correlated with severity of sleep apnea.<ref name="Yaremchuk2020" /> On average, males snore more loudly than females, and people with higher body mass index snore louder than those with lower body mass index.<ref name="Yaremchuk2020" />

==Mechanism==
[[File:Blausen 0872 UpperRespiratorySystem.png|thumb|right|alt=Upper respirator tract|Upper respiratory tract]]
Snoring has been [[Mathematical model|mathematically modelled]] wherein the upper airway is a tube which has an elastic or collapsible section. As the section of the upper airway narrows, [[Airway resistance|resistance to the flow of air]] increases.<ref name="Yaremchuk2020" /> There is a cyclical obstruction and reopening of the airway at the partially or fully collapsed section as air flows past.<ref name="Yap2022">{{cite journal |last1=Yap |first1=YY |title=Evaluation and Management of Snoring. |journal=Sleep Medicine Clinics |date=March 2022 |volume=17 |issue=1 |pages=25–39 |doi=10.1016/j.jsmc.2021.10.010 |pmid=35216759}}</ref> This obstruction and reopening occurs at approximately 50 times per second, which causes vibration and noise.<ref name="Yap2022" /> The airflow becomes unstable and [[Turbulence|turbulent]].<ref name="Yaremchuk2020" /> 

The structures that obstruct the airway and vibrate are various [[soft tissue]] structures at different levels along the upper respiratory tract or [[aerodigestive tract]].<ref name="DeMeyer2019" /> These are the [[uvula]], [[soft palate]], [[Fauces (throat)|faucial pillars]] ([[palatoglossal arch]], [[palatopharyngeal arch]]), [[palatine tonsil]]s, [[adenoid]] tonsil, walls of the [[pharynx]], [[epiglottis]], or lower structures.<ref name="ICSD-3" /><ref name="Yaremchuk2020" /> These structures may relax during sleep and move position, especially under the influence of gravity. This results in partial obstruction (narrowing) or complete obstruction of the airway. Partial obstruction of the airway is more associated with primary snoring, whereas complete obstruction is more a feature of obstructive sleep apnea.<ref name="Deenadayal2022" /> The following structures were found to vibrate during snoring: soft palate in 100% of cases, pharynx (53.8%), lateral pharyngeal wall (42.3%), epiglottis (42.3%), and tongue base (26.9%).<ref name="Yap2022" /> In primary snoring there may be vibration of the soft palate alone, termed "palatal fluttering". In mild to moderate obstructive sleep apnea, there may be vibration of the palate and lateral pharyngeal wall. In severe obstructive sleep apnea, there may be vibration of the tongue base and epiglottis in addition to the above structures.<ref name="Yap2022" />  
 
The snoring sound mainly occurs during inhalation (breathing in), but it may occur during exhalation (breathing out).<ref name="DeMeyer2019" /> Snorers have more negative pressure in their airway, increased inspiratory time, and limitation of respiratory flow.<ref name="Yaremchuk2020" /> On [[polysomnography]], snoring is usually louder during [[slow-wave sleep]] (stage 3 [[non-rapid eye movement sleep]]) or [[rapid eye movement sleep]].<ref name="ICSD-3" /> Snoring in obstructive sleep apnea usually occurs when airflow turbulence is maximum, which is during [[hyperpnea]] episodes at the end of [[apnea]] events (breathing cessation).<ref name="Yap2022" />

==Causes==
Snoring is often considered according to the location (level) of structure that is causing the obstruction and vibration. However, the sites causing the snoring vary from one person to the next, and the same individual may have multiple different sites which are contributing to the problem.<ref name="Dhingra2017" />

===Nasal cavity===
[[File:Illu nose nasal cavities.jpg|thumb|right|alt=Sagittal section of nasal cavity (nose). |Sagittal section of nasal cavity (nose).]]
While it is generally not possible for the rigidly supported structures inside the nose to vibrate, the patency of the nasal airway is important in the development of snoring.<ref name="Stuck2019" /> The [[nasal cavity]] causes over 50% of the total airway resistance, particularly at the [[internal nasal valve|internal]] and [[external nasal valve]]s.<ref name="Yap2022" /> The internal nasal valve is located approximately 1.5 cm from the nostril and constitutes the narrowest part of the upper airway.<ref name="Kiyohara2016">{{cite journal |last1=Kiyohara |first1=N |last2=Badger |first2=C |last3=Tjoa |first3=T |last4=Wong |first4=B |title=A Comparison of Over-the-Counter Mechanical Nasal Dilators: A Systematic Review. |journal=JAMA Facial Plastic Surgery |date=1 September 2016 |volume=18 |issue=5 |pages=385–9 |doi=10.1001/jamafacial.2016.0291 |pmid=27367589}}</ref> The external nasal valve is the tissue immediately around the nostril. [[Nasal valve collapse]] refers to weakening or narrowing of the supporting cartilage at the nasal valves. As per the [[Hagen–Poiseuille equation]], a minimal reduction in the diameter of a tube (in this case the nasal airway) results in an exponential change in airflow.<ref name="Casale2023">{{cite journal |last1=Casale |first1=M |last2=Moffa |first2=A |last3=Giorgi |first3=L |last4=Pierri |first4=M |last5=Lugo |first5=R |last6=Jacobowitz |first6=O |last7=Baptista |first7=P |title=Could the use of a new novel bipolar radiofrequency device (Aerin) improve nasal valve collapse? A systematic review and meta-analysis. |journal=Journal of otolaryngology - head & neck surgery = le Journal d'oto-rhino-laryngologie et de chirurgie cervico-faciale |date=22 June 2023 |volume=52 |issue=1 |pages=42 |doi=10.1186/s40463-023-00644-7 |doi-access=free |pmid=37349806 |pmc=10286448}}</ref> Nasal valve collapse is a cause of snoring.<ref name="Dhingra2017" /><ref name="Casale2023" />

[[Nasal congestion]] (nasal obstruction) reduces sleep quality.<ref name="Yap2022" /> Common reasons for nasal obstruction are [[allergic rhinitis]] and [[nonallergic rhinitis]].<ref name="Yap2022" /> [[Nasal septum deviation]] and [[inferior turbinate]] hypertrophy (enlargement) are present in almost all cases of snoring and obstructive sleep apnea.<ref name="Yap2022" /> Masses in the nasal cavity such as [[nasal polyp]]s or [[Paranasal sinus and nasal cavity cancer|tumors]] may also cause snoring.<ref name="Deenadayal2022" /><ref name="Dhingra2017" />

===Adenotonsillar hypertrophy===
[[Adenoid hypertrophy]] (enlargement of the [[adenoid]] tonsil) and [[Palatine_tonsil#Tonsillar_hypertrophy|tonsillar hypertrophy]] (enlargement of the [[palatine tonsil]]s) is associated with snoring and obstructive sleep apnea,<ref name="Sakarya2017">{{cite journal |last1=Sakarya |first1=EU |last2=Bayar Muluk |first2=N |last3=Sakalar |first3=EG |last4=Senturk |first4=M |last5=Aricigil |first5=M |last6=Bafaqeeh |first6=SA |last7=Cingi |first7=C |title=Use of intranasal corticosteroids in adenotonsillar hypertrophy. |journal=The Journal of Laryngology and Otology |date=May 2017 |volume=131 |issue=5 |pages=384–390 |doi=10.1017/S0022215117000408 |pmid=28238295}}</ref><ref name="ICSD-3" /><ref name="Chawla2015" /> especially in children since the tonsils are larger at younger ages. Adenotonsillar hypertrophy is the most common cause of snoring in children.<ref name="Dhingra2017" />

===Mouth===
Dental problems may be conditions associated with snoring rather than direct causes. Examples include [[malocclusion]], crowding of upper teeth, a narrow [[palate]],<ref name="Chawla2015" /> and a [[high-arched palate]]. Narrow palate and high-arched palate create a predisposition to chronic nasal obstruction.<ref name="Yap2022" />

===Mouth breathing===
[[Mouth breathing]] frequently accompanies snoring as one of main features of sleep-related breathing disorders (including primary snoring, upper airway resistance syndrome, and obstructive sleep apnea).<ref name="Pacheco2015">{{cite journal |last1=Pacheco |first1=MC |last2=Casagrande |first2=CF |last3=Teixeira |first3=LP |last4=Finck |first4=NS |last5=de Araújo |first5=MT |title=Guidelines proposal for clinical recognition of mouth breathing children. |journal=Dental Press Journal of Orthodontics |date=July 2015 |volume=20 |issue=4 |pages=39–44 |doi=10.1590/2176-9451.20.4.039-044.oar |pmid=26352843 |pmc=4593528}}</ref> In one study, 18% of people with mouth breathing reported awareness of snoring.<ref name="Pacheco2015" /> 

===Retrognathia===
[[Retrognathia]] (receded lower jaw) is more common in obstructive sleep apnea than in primary snoring.<ref name="Yap2022" /> [[Micrognathia]] (small jaw size) is also linked to snoring.<ref name="Chawla2015" />

===Pharynx===
The muscles of the pharynx relax during sleep, causing partial airway obstruction.<ref name="Dhingra2017">{{cite book |last1=Dhingra |first1=PL |last2=Dhingra |first2=S |title=Diseases of Ear, Nose and Throat & Head and Neck Surgery |date=7 October 2017 |publisher=Elsevier Health Sciences |isbn=978-81-312-4939-0 |pages=313 |language=en}}</ref> The oropharynx is a common site which causes snoring noises.<ref name="Stuck2019" />

===Tongue===
When sleeping on the back, gravity pulls the tongue backwards and may obstruct the airway.<ref name="mayo">{{cite web |url=http://www.mayoclinic.org/diseases-conditions/snoring/basics/causes/con-20031874 |title=Snoring Causes |date=26 April 2015 |website=Mayo Clinic |access-date=15 June 2016}}</ref> An enlarged tongue, termed [[macroglossia]], is a potential cause for snoring.<ref name="Dhingra2017" /> Obesity may result in increased tongue size.<ref name="Yaremchuk2020" /> The base of the tongue may be enlarged and cause snoring, e.g. because of a [[Oral cancer|tumor]].<ref name="Dhingra2017" />

===Larynx and laryngopharynx===
Problems within the [[larynx]] ("voice box") and [[laryngopharynx]] may cause snoring, such as [[laryngeal stenosis]] or an omega-shaped [[epiglottis]].<ref name="Dhingra2017" /> 

===Obstructive sleep apnea===
Snoring is one of the cardinal symptoms of obstructive sleep apnea.<ref name="ICSD-3" /> People who snore are five times more likely to have obstructive sleep apnea compared to those who don't snore.<ref name="Yap2022" /> Snoring is common in upper airways resistance syndrome, and obstructive sleep apnea is almost always associated with snoring.<ref name="Deenadayal2022" />

===Obesity===
Being [[obesity|obese]] or [[overweight]] increases the amount of [[Adipose tissue|fat]] around the throat. It is not just body mass index that is important, but the circumference of the neck (e.g., collar size more than {{Convert|42|cm|in|abbr=on}})<ref name="Dhingra2017" /> and the size of the tongue.<ref name="Yaremchuk2020" /> [[Obesity hypoventilation syndrome]] also involves snoring.<ref name="Deenadayal2022">{{cite book |last1=Deenadayal |first1=DS |last2=Bommakanti |first2=V |title=Management of Snoring and Obstructive Sleep Apnea: A Practical Guide |date=4 January 2022 |publisher=Springer Nature |isbn=978-981-16-6620-9 |language=en |pages= 1, 4, 14, 29, 34, 44, 50, 51, 55, 56, 64, 98}}</ref>

===Alcohol===
[[Alcohol (drug)|Alcohol]] causes muscle relaxation via its [[depressant]] effect on the [[central nervous system]]. This muscle relaxation seems to be more pronounced for the tongue,<ref name="Yaremchuk2020" /> which may then be more prone to obstruct the airway. 

===Muscle relaxants===
Medications that cause muscle relaxation, such as [[sedative]]s and [[hypnotic]]s, may cause snoring or make it worse. One example is [[diphenhydramine]].<ref name="Yaremchuk2020" />

===Diet===
Magnesium is a [[micronutrient]] which may have a role in maintaining [[circadian rhythm]] and sleep quality.<ref name="Arab2024" /> There may be a connection between higher magnesium intake and sleep quality, which includes factors such as snoring, daytime sleepiness, and sleep duration. One study supported this connection. Another study showed that 332.5 mg/day magnesium did not have any effect on sleep symptoms such as snoring and sleepiness.<ref name="Arab2024">{{cite journal |last1=Arab |first1=A |last2=Rafie |first2=N |last3=Amani |first3=R |last4=Shirani |first4=F |title=The Role of Magnesium in Sleep Health: a Systematic Review of Available Literature. |journal=Biological Trace Element Research |date=January 2023 |volume=201 |issue=1 |pages=121–128 |doi=10.1007/s12011-022-03162-1 |pmid=35184264|bibcode=2023BTER..201..121A }}</ref>

===Pregnancy===
Sometimes snoring starts during [[pregnancy]].<ref name="ICSD-3" /><ref name="Jung2022">{{cite journal |last1=Jung |first1=E |last2=Romero |first2=R |last3=Yeo |first3=L |last4=Gomez-Lopez |first4=N |last5=Chaemsaithong |first5=P |last6=Jaovisidha |first6=A |last7=Gotsch |first7=F |last8=Erez |first8=O |title=The etiology of preeclampsia. |journal=American Journal of Obstetrics and Gynecology |date=February 2022 |volume=226 |issue=2S |pages=S844–S866 |doi=10.1016/j.ajog.2021.11.1356 |pmid=35177222 |pmc=8988238}}</ref>

===Hereditary factors===
Some people have a genetic predisposition to snoring, a proportion of which may be mediated through other heritable lifestyle factors such as body mass index, smoking and alcohol consumption.<ref name=":0">{{cite journal | vauthors = Campos AI, García-Marín LM, Byrne EM, Martin NG, Cuéllar-Partida G, Rentería ME | title = Insights into the aetiology of snoring from observational and genetic investigations in the UK Biobank | journal = Nature Communications | volume = 11 | issue = 1 | pages = 817 | date = February 2020 | pmid = 32060260 | pmc = 7021827 | doi = 10.1038/s41467-020-14625-1 | bibcode = 2020NatCo..11..817C }}</ref> The [[DLEU1]] gene (part of BCMS) has been linked to snoring.<ref>{{cite journal |last1=Campos |first1=AI |last2=Ingold |first2=N |last3=Huang |first3=Y |last4=Mitchell |first4=BL |last5=Kho |first5=PF |last6=Han |first6=X |last7=García-Marín |first7=LM |last8=Ong |first8=JS |last9=23andMe Research Team |last10=Law |first10=MH |last11=Yokoyama |first11=JS |last12=Martin |first12=NG |last13=Dong |first13=X |last14=Cuellar-Partida |first14=G |last15=MacGregor |first15=S |last16=Aslibekyan |first16=S |last17=Rentería |first17=ME |title=Discovery of genomic loci associated with sleep apnea risk through multi-trait GWAS analysis with snoring. |journal=Sleep |date=9 March 2023 |volume=46 |issue=3 |doi=10.1093/sleep/zsac308 |pmid=36525587 |pmc=9995783}}</ref>

==Possible consequences==
Most people with primary snoring do not have any significant health problems as a result of the snoring.<ref name="Changsiripun2024" /> Typically, associations with other health conditions are better understood and researched for obstructive sleep apnea than for primary snoring without obstructive sleep apnea.<ref name="Stuck2019" />

===For sleeping partner===
It is sometimes suggested that snoring is more of a problem for the sleeping partner than the person who snores.<ref name="Yaremchuk2020" /> Snoring of one partner may cause marital discord, and sometimes has even lead to a divorce.<ref name="Dhingra2017" /> The term "snoring spouse syndrome" has been used to describe the health effects for sleeping partners of people with obstructive sleep apnea.<ref name="Deenadayal2022" /><ref name="Dhingra2017" /> Snorers may be unaware of their snoring.<ref name="Yaremchuk2020" /> It may be difficult for sleeping partners to adjust to the noise because snoring may be irregular, changing in volume and character.<ref name="Yaremchuk2020" /> This may wake them and prevent them from falling asleep again.<ref name="Yaremchuk2020" /> Sleeping partners may try to nudge the snorer. This may trigger the snorer to change position, or it may rouse them sufficiently to reduce the muscle relaxation in the upper airway, lessening the snoring.<ref name="Yaremchuk2020" /> Partners of snorers may use other strategies to minimize the impact of snoring such as [[earplug]]s, going to sleep at a different time, or sleeping in a different room.<ref name="Duncan2019">{{cite book |last1=Duncan |first1=DT |last2=Kawachi |first2=I |last3=Redline |first3=S |title=The Social Epidemiology of Sleep |date=2019 |publisher=Oxford University Press |isbn=978-0-19-093044-8 |pages=122 |language=en}}</ref>

In one study, treatment of snoring in males (with continuous positive airway pressure) resulted in 13% better sleep efficiency and an average of 1 hour of extra sleep for their female sleeping partners.<ref name="Yaremchuk2020" /> One hour of lost sleep per day equates to a whole night of lost sleep each week. This may result in chronic [[sleep deprivation]] for sleeping partners of snorers.<ref name="Yaremchuk2020" /> It has also been reported that sleeping partners of snorers may gradually develop [[hearing loss]], although there is little evidence for this. In one small study, sleeping partners had detectable hearing loss in the ear that was habitually facing the snorer.<ref name="Yaremchuk2020" /> 

Parents of children who snore may also suffer reduced sleep quality.<ref name="Chawla2015" />

===Cognitive and psychological===
Snoring may cause sleep deprivation for snorers. Snoring, even when not associated with obstructive sleep apnea, has been linked to [[excessive daytime sleepiness]].<ref name="Huang2023" /> Snoring may cause other problems such as [[irritability]],<ref name="Dhingra2017" /> [[Depression (mood)|depression]],<ref name="Dhingra2017" /> [[memory loss]],<ref name="Dhingra2017" /> [[fatigue]],<ref name="Dhingra2017" /> lack of [[Focusing (psychotherapy)|focus]] and decreased [[libido]].<ref name="Dhingra2017" /> It has also been suggested that it increases the risk of [[road traffic accident]]s.<ref name="Dhingra2017" /> 

In children, snoring may affect growth.<ref name="Chawla2015" /> It may also affect mood, attention, intelligence, and reduce academic performance at school.<ref name="ICSD-3" /><ref name="Chawla2015" /><ref name="Deenadayal2022" /> Snoring may manifest as behavioral problems, hyperactivity, and impulsivity.<ref name="Chawla2015" /><ref name="Deenadayal2022" />

===Cardiovascular disease===
Some studies report that there is a higher prevalence of [[cardiovascular disease]] in snorers. This includes [[metabolic syndrome]],<ref name="Changsiripun2024" /> [[hypertension]] (high blood pressure),<ref name="ICSD-3" /> and [[atherosclerosis]],<ref name="Bai2021" /> 

There may be up to a 46% increased risk of [[stroke]],<ref name="Bai2021" >{{cite journal | vauthors = Bai J, He B, Wang N, Chen Y, Liu J, Wang H, Liu D | title = Snoring Is Associated With Increased Risk of Stroke: A Cumulative Meta-Analysis | journal = Frontiers in Neurology | volume = 12 | pages = 574649 | date = 2021 | pmid = 33868139 | pmc = 8047148 | doi = 10.3389/fneur.2021.574649 | doi-access = free }}</ref> and 28% increased risk of [[coronary artery disease]] / ischemic heart disease (probably in part explained by snoring with obstructive sleep apnea).<ref name="Liu2021" /> Snoring causes increased inspiratory effort. This may increase the circulatory load on the heart.<ref name="Liu2021">{{cite journal |last1=Liu |first1=J |last2=Shao |first2=Y |last3=Bai |first3=J |last4=Shen |first4=Y |last5=Chen |first5=Y |last6=Liu |first6=D |last7=Wang |first7=H |title=Snoring increases the development of coronary artery disease: a systematic review with meta-analysis of observational studies. |journal=Sleep & Breathing = Schlaf & Atmung |date=December 2021 |volume=25 |issue=4 |pages=2073–2081 |doi=10.1007/s11325-021-02345-9 |pmid=33754248}}</ref> Impaired balance between the sympathetic and parasympathetic nervous system may also be involved.<ref name="Liu2021" /> Smoking may cause intermittent [[Hypoxia (medicine)|hypoxia]], [[oxidative stress]], and inflammation.<ref name="Liu2021" /> These processes may damage the [[endothelium]] (the lining of blood vessels).<ref name="Liu2021" /> In addition to the above factors, sleep apnea may cause [[insulin resistance]], dysfunction of endothelium, [[diabetes]], [[dyslipidemia]], and hypertension.<ref name="Bai2021" />  However, not all studies report increased risk of cardiovascular disease in those who snore.<ref name="ICSD-3" /><ref name="Bai2021" /> 

There is limited evidence that snoring may cause atherosclerosis of the [[carotid artery]].<ref name="ICSD-3" /> In research on animals, vibration energy from snoring may be transmitted to the carotid artery. This vibration causes damage to the endothelium. The binding ability of [[low density lipoprotein]] may also be increased by acoustic waves.<ref name="Yaremchuk2020" /> In other words, vibrations from snoring may damage blood vessels, cause formation of atherosclerotic plaque, and also increase the probability that the plaque ruptures.<ref name="Bai2021" /> Both non apneic snoring and snoring associated with obstructive sleep apnea have been correlated with carotid atherosclerosis, [[carotid artery stenosis]], and other carotid disease in humans.<ref name="Yaremchuk2020" /> In one study, snorers had 50% higher chance of carotid stenosis and were more likely to have carotid disease on both the left and right sides.<ref name="Yaremchuk2020" />

Snoring that starts during pregnancy may be linked with higher risk of [[gestational hypertension]] and [[preeclampsia]].<ref name="ICSD-3" /><ref name="Jung2022" />

===Headaches===
Snoring is also linked to [[headache]]s and [[migraine]]s, especially headache upon waking.<ref name="Huang2023">{{cite journal |last1=Huang |first1=Z |last2=Zhou |first2=N |last3=Chattrattrai |first3=T |last4=van Selms |first4=MKA |last5=de Vries |first5=R |last6=Hilgevoord |first6=AAJ |last7=de Vries |first7=N |last8=Aarab |first8=G |last9=Lobbezoo |first9=F |title=Associations between snoring and dental sleep conditions: A systematic review. |journal=Journal of Oral Rehabilitation |date=May 2023 |volume=50 |issue=5 |pages=416–428 |doi=10.1111/joor.13422 |pmid=36691754|hdl=10067/1942640151162165141 |hdl-access=free }}</ref> This may be related to [[cerebral hypoxia]], [[hypercapnia]], and temporary increased [[intra-cranial pressure]].<ref name="Huang2023" /> Snoring is associated with respiratory event-related arousals, which may be connected with headache.

===Gastroesophageal reflux disease===
Snoring and obstructive sleep apnea are associated with higher rates of [[gastroesophageal reflux disease]], including acid reflux which occurs during sleep.<ref name="Huang2023" /> There is increased negative pressure in the [[thoracic cavity]] during apneic episodes. It was suggested that this negative pressure may overcome the [[lower esophageal sphincter]] and allow stomach contents to reflux into the [[esophagus]]. However, the lower esophageal sphincter was found to be stronger during obstructed breathing events. Another theory which explains the connection is that snoring and obstructive sleep apnea may promote transient lower esophageal sphincter relaxations.<ref name="Huang2023" /> Enlarged tonsils are also seen in gastroesophageal reflux disease,<ref name="Huang2023" /> and this may contribute to airway restriction and snoring. 

===Sleep bruxism===
There is conflicting evidence for and against a possible connection between snoring and [[sleep bruxism]] (teeth grinding during sleep). It may be that in snoring and obstructive sleep apnea, there are periods of activation of oropharyngeal muscles. These are necessary to restore patency of the collapsed / obstructed airway. This muscle activity may also trigger activity in the muscles of mastication and hence sleep bruxism.<ref name="Huang2023" /> 

===Dry mouth===
There is limited and contradictory evidence for a connection between snoring and [[xerostomia]] (dry mouth).<ref name="Huang2023" /> [[Tissue biopsies]] of the uvula have been carried out on heavy snorers and people with severe obstructive sleep apnea. The biopsies showed abnormal [[Salivary_gland#Minor_salivary_glands|minor salivary gland]]s. There was increased volume of [[Mucous gland|mucous salivary gland]]s and reduced quantity and volume of [[Serous gland|serous salivary gland]]s. This may cause reduced production of [[saliva]]. Snorers also tend to breath through their mouths during sleep, in order to get more air. This may have a drying effect in the mouth.<ref name="Huang2023" />

===Other===
[[Nerve damage]] may occur in the soft palate as a result of chronic trauma from vibration. This is leads to morphological changes in the palate.<ref name="ICSD-3" /> 

==Diagnosis==
{{Listen
| type         = audio
| filename     = Palatal snoring 1.ogg
| title        = Snoring caused by vibration of soft palate
| description  = 
| filename2    = Tongue base snoring.ogg
| title2       = Snoring caused by back of tongue
| description2 = 
| filename3    = Snoring under severe sleep apnoea - 1741-7015-9-17.oga
| title3       = Snoring with breath holding in association with sleep apnea
| description3 = 
}}
According to ICSD-3, primary snoring may diagnosed with the following [[diagnostic criteria]]:<ref name="Stuck2019" />

* Affected individual or sleeping partner reports breath sounds associated with breathing in during sleep.
* No other sleep disorder that could be causing the snoring.
* Diagnostic investigations such as polysomnography do not show another sleep related respiratory disorder.

Questioning of not just the snorer but also their sleeping partner may be useful in the diagnostic process.<ref name="Yaremchuk2020" /> The following parameters may be recorded: snoring frequency (less than 3 nights per week or every night), loudness, character (regular or irregular pattern), associated with inhalation or exhalation, and whether the snoring is associated with certain sleeping positions.<ref name="Stuck2019" /> Any aggravating factors may be identified, such as alcohol, smoking, or nasal congestion.<ref name="Stuck2019" /> Associated symptoms may be identified, such as insomnia, breathing pauses during sleep, waking with difficulty breathing, dry mouth, daytime sleepiness, and poor concentration.<ref name="Stuck2019" /> Any history of potentially related conditions may be recorded, such as cardiovascular disease, obesity, and diabetes.<ref name="Stuck2019" /> It is sometimes useful if the individual or their sleeping partner provides an audio recording of the snoring.<ref name="Yaremchuk2020" /> Audio recordings may highlight apnea. Palatal snoring (caused by vibration of the soft palate) has an average peak frequency of 137 hertz. Snoring caused by the tongue base has 1243 Hz. Combined palatal and tongue snoring has 190 Hz. Snoring caused by epiglottis has 490 Hz.<ref name="Yaremchuk2020" />

[[Physical examination]] is normally carried out. The morphology of the facial skeleton is noted.<ref name="Stuck2019" /> Examination of the nasal cavity may be done with [[Rhinoscope#Anterior_rhinoscopy|anterior rhinoscopy]] and nasal [[endoscopy]], which may identify problems inside the nose such as deviated septum, hypertrophic inferior turbinate, or nasal polyps.<ref name="Deenadayal2022" /> The mouth and teeth are also examined.<ref name="Stuck2019" /> The oropharynx may be examined with flexible transnasal endoscope (through the nose) or rigid transoral endoscope (through the mouth).<ref name="Stuck2019" /> If laryngeal snoring is suspected, [[laryngoscopy]] or [[drug-induced sleep endoscopy]] may be carried out.<ref name="Stuck2019" /> The latter investigation enables examination of the upper respiratory tract while the patient is unconscious.<ref name="Stuck2019" /> [[Bronchoscopy]] may also be carried out.<ref name="Chawla2015" /> 

To diagnose primary snoring, it is necessary first to rule out obstructive sleep apnea and all other sleep-related respiratory disorders.<ref name="Yaremchuk2020" /> This usually requires an overnight [[sleep study]] (polysomnography),<ref name="Yaremchuk2020" /> which is the [[Gold standard (test)|gold standard]] in investigation and diagnosis of sleep disorders.<ref name="Stuck2019" /> A sleep study includes calculation of the apnea–hypopnea index, and measurement of many other parameters such as the total number of snoring events, flow limitations without snoring (indicates nasal obstruction), and flow limitation with snoring (indicates obstruction from palate and tongue base).<ref name="Deenadayal2022" /> Home sleep apnea test is another option, allowing calculation of apnea-hypopnea index and [[respiratory disturbance index]] and differentiation between primary snoring and obstructive sleep apnea.<ref name="Changsiripun2024">{{cite journal |last1=Changsiripun |first1=C |last2=Chirakalwasan |first2=N |last3=Dias |first3=S |last4=McDaid |first4=C |title=Management of primary snoring in adults: A scoping review examining interventions, outcomes and instruments used to assess clinical effects. |journal=Sleep Medicine Reviews |date=October 2024 |volume=77 |pages=101963 |doi=10.1016/j.smrv.2024.101963 |pmid=38889620|url=https://eprints.whiterose.ac.uk/213009/1/Revised_manuscript_for_Sleep_Medicine_Reviews_2024.04.29.pdf }}</ref> 

Other investigations may sometimes be done, such as nasal function testing (e.g., [[rhinomanometry]]), pharyngeal manometry, [[allergy testing]], acoustic analysis, or [[medical imaging]].<ref name="Stuck2019" />

==Treatment==
Almost all treatments for snoring revolve around lessening the noise and improving air flow by reducing the blockage in the airway.

===Lifestyle modification===
Lifestyle changes are a first-line treatment to stop snoring.<ref>{{cite web | vauthors = Alam II | date = 15 December 2022 |url=http://www.medical-reference.net/2013/09/how-to-stop-snoring-causes-remedies.html|publisher = Medical-Reference|title = How to Stop Snoring: Causes, Cures, and Remedies|access-date= 26 September 2016}}</ref> Recommended lifestyle changes include stopping [[smoking]],<ref name="Stuck2019" /> avoiding alcohol before bedtime,<ref>{{cite web |url=https://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072458/|publisher = U.S. National Library of Medicine — Pubmed Health|title = Obstructive sleep apnea: Overview|access-date= 26 September 2016}}</ref> and [[Sleeping positions|sleeping on the side]] (lateral position).<ref name="Dhingra2017" /> Sleeping on the side reduces the tendency for the base of tongue to fall back and obstruct the airway. This occurs when sleeping on the back (supine position) since gravity pulls the tongue backwards in this position. [[weight loss|Losing weight]] reduces the amount of fat that compresses the airway. Even a modest amount of weight loss, such as 4.5 kg (10 lbs) can improve snoring.<ref name="Yaremchuk2020" />  

Improving [[sleep hygiene]] may be beneficial. Examples include establishing fixed routines for bedtime and wake up time, including on weekends.<ref name="Chawla2015" /> Relaxation before sleep may help people get to sleep more quickly. Applications for smartphones and smartwatches are available. They often record snoring during sleep, compare snoring severity over time, and give advice to users. Some apps trigger a sound or vibration when the person starts to snore.<ref name="Yaremchuk2020" /> Many over-the-counter snoring treatments, such as stop-snoring rings or wrist-worn electrical stimulation bands, have no scientific evidence to support their claims.

===Nasal strips and dilators===
Many types of [[nasal strip]]s, nose clips, and internal dilators are available to temporarily prevent nasal valve collapse. They are all designed to stent and expand the internal nasal valve.<ref name="Casale2023" />

===Orthopedic pillows===
[[Orthopedic pillow]]s are designed to support the head and neck in a way that ensures the jaw stays open and slightly forward. This helps keep the airways unrestricted as possible and in turn leads to reduced snoring. A pillow that was designed to change the position of the head was found to reduce snoring intensity both subjective and objectively (with polysomnography).<ref name="Stuck2019" />

===Medications===
Medications are usually not helpful in treating snoring symptoms, though they can help control some of the underlying causes such as [[nasal congestion]] and allergic reactions. [[Corticosteroid]] nasal sprays and drops can reduce inflammation in nasal mucosa and reduce the size of the adenoid, thereby reducing symptoms of obstructive sleep apnea such as snoring.<ref name="Chawla2015" /> [[Montelukast]] has also been used in the same application.<ref name="Chawla2015" /> Systemic medication and oils and sprays for the mouth are not recommended.<ref name="Stuck2019" /> A temporary period of nasal decongestants may allow for simulation of the potential effect of surgery on the nasal concha in that individual.<ref name="Stuck2019" /> Medications that aggravate snoring such as sedatives may be avoided before bedtime, or they may be substituted for weaker alternatives.<ref name="Yaremchuk2020" /> 

===Myofunctional therapy (oropharyngeal exercises)===
Myofunctional therapy (also termed myofascial therapy) incorporates oropharyngeal (mouth and throat) and tongue exercises. The exercises are usually combinations of isotonic and isometric exercises involving different muscles of the soft palate, tongue, face, pharynx, jaw, and upper respiratory tract.<ref name="Rueda2020" /> Pronouncing vowel sounds activates muscles in the soft palate and uvula.<ref name="Camacho2017" /> Tongue exercises may involve movement of the tongue in different directions, sticking out the tongue, and pressing the tongue against hard and soft tissue surfaces in the mouth.<ref name="Camacho2017" /> Facial exercises may involve pushing out the cheek with a finger while puckering, closing, or moving the lips.<ref name="Camacho2017" /> Jaw exercises may involve chewing<ref name="Rueda2020" /> and opening and closing the mouth.<ref name="Camacho2017" /> Pharyngeal exercises may involve swallowing.<ref name="Camacho2017" /> Other exercises include sucking through a narrow straw and blowing up balloons.<ref name="Camacho2017">{{cite journal | vauthors = Camacho M, Guilleminault C, Wei JM, Song SA, Noller MW, Reckley LK, Fernandez-Salvador C, Zaghi S | display-authors = 6 | title = Oropharyngeal and tongue exercises (myofunctional therapy) for snoring: a systematic review and meta-analysis | journal = European Archives of Oto-Rhino-Laryngology | volume = 275 | issue = 4 | pages = 849–855 | date = April 2018 | pmid = 29275425 | doi = 10.1007/s00405-017-4848-5 | s2cid = 3679407 }}</ref> Myofunctional therapy is theorized to improve the tone and positioning of the muscles.<ref name="Camacho2017" /> The exercises may promote a closed mouth breathing position where the tongue is in contact with the palate.<ref name="Camacho2017" /> This may create negative pressure in the mouth, leading to a stabilization of patency of the pharynx and reduced muscular effort required to keep the airway open.<ref name="Camacho2017" />

There is conflicting evidence for the effectiveness of myofunctional therapy in snoring.<ref name="Rueda2020" /> One systematic review found that myofunctional therapy reduces snoring in adults based on both subjective questionnaires and objective sleep studies.<ref name="Camacho2017" /> Snoring intensity was reduced by 51%.<ref name="Camacho2017" /> Time spent snoring was reduced by 31% as measured by polysomnography.<ref name="Camacho2017" /> One study used objective measurement of snoring (audio recordings) and found that myofunctional therapy had little to no effect in reducing snoring frequency.<ref name="Rueda2020" /> Another study reported that myofunctional therapy had a possible reduction in snoring frequency and intensity (measured subjectively) compared to sham therapy (placebo).<ref name="Rueda2020">{{cite journal |last1=Rueda |first1=JR |last2=Mugueta-Aguinaga |first2=I |last3=Vilaró |first3=J |last4=Rueda-Etxebarria |first4=M |title=Myofunctional therapy (oropharyngeal exercises) for obstructive sleep apnoea. |journal=The Cochrane Database of Systematic Reviews |date=3 November 2020 |volume=2020 |issue=11 |pages=CD013449 |doi=10.1002/14651858.CD013449.pub2 |pmid=33141943 |pmc=8094400}}</ref> When myofunctional therapy combined with CPAP is compared to myofunctional therapy alone, there may be little to no difference.<ref name="Rueda2020" /> There is insufficient evidence to recommend myofunctional therapy for snoring in adults.<ref name="Stuck2019" /> Myofunctional therapy may be more useful in children who snore than in adults.<ref name="Deenadayal2022" /> 

===Dental appliances===
[[File:Avance mandibular.jpg|thumb|One style of mandibular advancement splint]]
Dental appliances are common treatments for snoring. They may be custom made, which requires an [[Dental impression|impression]] of the teeth and construction in a [[dental laboratory]], or they may be bought over the counter without involvement of a dental health professional. The latter type are often "boil and bite" appliances which come in a set size. The appliance is immersed in boiling water and then the individual bites into appliance with the jaw in a protruded position. Oral appliances may be titratable (adjustable) or non-titratable (one fixed position).<ref name="Ramar2015" /> In general, oral appliances are cheap and non-invasive.<ref name="Deenadayal2022" /> They can be combined with CPAP treatment.<ref name="Deenadayal2022" /> Complications include discomfort, excessive [[saliva]]tion (drooling),<ref name="Deenadayal2022" /> insomnia,<ref name="Deenadayal2022" /> pain in the [[periodontal ligament]] of teeth if they are under excessive force, pain in the [[temporomandibular joint]]<ref name="Deenadayal2022" /> and [[muscles of mastication]] (e.g. [[temporalis]]), and [[Dislocation of jaw|jaw dislocation]].<ref name="Deenadayal2022" /> Some devices prevent anterior oral seal, and therefore cause mouth breathing with the associated problems like dry mouth.<ref name="Deenadayal2022" /> A device which covers only some of the teeth and leaves others uncovered may potentially have a [[Dahl effect]], leading to undesired movement of the teeth and creating problems like [[open bite]].<ref name="Deenadayal2022" /> Therefore, a dentist should regularly review individuals who are using dental appliances for snoring.<ref name="Ramar2015" />
  
[[Mandibular advancement splint]]s (mandibular repositioning splints) push the lower jaw forwards. The tongue has muscular connections to the mandible and therefore is pulled forwards at the same time, which prevents obstruction of the airway at the oropharynx. This is a similar mechanism to the [[jaw-thrust maneuver]] used to maintain patency of a supine patient in first aid. In addition, mandibular advancement splints increase the tension in the soft palate and pharyngeal walls.<ref name="Deenadayal2022" /> Mandibular advancement splints are used for snoring and for mild to moderate obstructive sleep apnea.<ref name="Deenadayal2022" /> They may be useful for people with [[retrognathia]] (receded lower jaw).<ref name="Dhingra2017" /> Mandibular advancement splints are better tolerated than CPAP.<ref name="Stuck2019" /><ref name="Ramar2015" /> They can reduce snoring loudness and improve quality of life of snorers and their sleeping partners.<ref name="Ramar2015" />

Tongue repositioning (retaining) devices are made of soft acrylic and cover the upper and lower teeth and create a seal with the lips. They have a "bulb" or "bubble" which sticks out the front of the mouth. This creates negative suction pressure, holding the tongue in a forward position and increasing the airway space behind the tongue.<ref name="Deenadayal2022" /> Soft-palate lifters are devices which lift the soft palate. They are useful for people who have weak muscles in the region.<ref name="Deenadayal2022" />

===Orthodontic treatment===
[[Orthodontics|Orthodontic treatment]] may improve some dental problems associated with snoring,<ref name="Chawla2015" /> such as a narrow palate.

===Positive airway pressure===
{{Main|Positive airway pressure}}
[[Continuous positive airway pressure]] (CPAP) is a machine which pumps air through a flexible hose to a mask worn over the mouth, nose, or both. The pressure of the air keeps the airway open. CPAP is considered the gold standard treatment for obstructive sleep apnea.<ref name="Changsiripun2024" /> It has been shown to reduce snoring associated with obstructive sleep apnea.<ref name="Changsiripun2024" /> However, CPAP can be uncomfortable, and many people stop using it. This is especially true for primary snoring.<ref name="Changsiripun2024" />

===Surgery===
{{main|Sleep surgery}}

Surgical procedures outside the nose and soft palate for treatment of primary snoring have been discouraged.<ref name="Stuck2019" /> Many different surgical procedures have been used for snoring, including: 
* [[Nasal surgery|Nasal surgeries]],<ref name="Deenadayal2022" /> e.g. [[septoplasty]], [[Nasal_surgery#Turbinoplasty|turbinoplasty]], various procedures for nasal valve collapse (spreader grafts, spreader flaps, butterfly grafts, batten grafts).<ref name="Casale2023" /> 
* Palatal surgeries,<ref name="Deenadayal2022" /> e.g. [[uvulopalatopharyngoplasty]] (most commonly performed procedure for snoring),<ref name="Dhingra2017" /> palatal implants ([[pillar procedure]]), [[somnoplasty]] (may combine other sites) 
* [[Adenoidectomy]] or [[tonsillectomy]] (or combined, termed adenotonsillectomy).<ref name="Chawla2015" />
* Tongue base surgeries<ref name="Deenadayal2022" />
* Hypopharyngeal surgery<ref name="Deenadayal2022" />
* [[Orthognathic surgery]], e.g. maxillary mandibular advancement<ref name="Deenadayal2022" />
* [[Hypoglossal nerve stimulation]]<ref name="Deenadayal2022" />
* [[Tracheostomy]]<ref name="Deenadayal2022" />
* [[Bariatric surgery]]<ref name="Deenadayal2022" />

==Epidemiology==
Snoring is one of the most common sleep disorders.<ref name="Bai2021" /> The reported prevalence of snoring varies significantly depending on the population studied,<ref name="Changsiripun2024" /> and because there is no universally accepted definition of snoring.<ref name="Stuck2019">{{cite journal |last1=Stuck |first1=BA |last2=Hofauer |first2=B |title=The Diagnosis and Treatment of Snoring in Adults. |journal=Deutsches Ärzteblatt International |date=29 November 2019 |volume=116 |issue=48 |pages=817–824 |doi=10.3238/arztebl.2019.0817 |pmid=31888795 |pmc=6947688}}</ref> Occasional snoring is almost universally present in humans. Habitual (primary snoring) is less common but still a common problem.<ref name="Chang2023" /> 

Snoring affects 2.6–83% of males and 1.5–71% of females.<ref name="Changsiripun2024" /> Snoring is more common in males than females.<ref name="Chang2023" /> In research about obstructive sleep apnea, it was found that the upper airway is longer and more collapsible in males, and that fat is distributed differently in males and females<ref name="Chang2023" />  

Snoring is more common in older people.<ref name="Changsiripun2024" /> However, after age 70, awareness of snoring decreases. This is possibly related to hearing loss.<ref name="ICSD-3" /> Snoring also has positive correlations with larger body-mass index, lower socio-economic status, and more frequent smoking and alcohol consumption.<ref name=":0" /> Snoring affects about 8–12% of children.<ref name="Chawla2015">{{cite journal |last1=Chawla |first1=J |last2=Waters |first2=KA |title=Snoring in children. |journal=Journal of Paediatrics and Child Health |date=September 2015 |volume=51 |issue=9 |pages=847-50; quiz 850-1 |doi=10.1111/jpc.12976 |pmid=26333074}}</ref>

==Society and culture==
There are descriptions of snoring in the fifteenth century.<ref name="Yaremchuk2020" /> Uvulopalatopharyngoplasty was proposed in 1964 by Ikematsu as a treatment for snoring.<ref>Ikematsu, T (1964). "Study of snoring". Therapy. ''J Jpn Otol Rhinol Laryngol Soc'' '''64''': 434–435</ref> CPAP was first used for snoring and obstructive sleep apnea in 1981.<ref name="Deenadayal2022" /> Compared to obstructive sleep apnea, primary snoring has received less attention in research.<ref name="Changsiripun2024" />

Snoring is sometimes not considered as a medical condition by medical insurance companies, meaning that treatments may not be covered by insurance.<ref name="Yaremchuk2020" /> 

"[[Zzz (disambiguation)|Zzz]]" is a common [[Onomatopoeia|onomatopeic]] representation of snoring. It may have developed from use in comics.<ref name="Yaremchuk2020">{{cite journal |last1=Yaremchuk |first1=K |title=Why and When to Treat Snoring. |journal=Otolaryngologic Clinics of North America |date=June 2020 |volume=53 |issue=3 |pages=351–365 |doi=10.1016/j.otc.2020.02.011 |pmid=32336469}}</ref>

== References ==
{{Reflist}}

== External links ==
{{Medical resources
|  DiseasesDB     = 12260 
|  ICD10          = R06.5 
|  ICD9           = {{ICD9|786.09}} 
|  MedlinePlus    = 003207 
|  MeshID         = D012913
}}
{{SleepSeries2}}
{{Circulatory and respiratory system symptoms and signs}}
{{Authority control}}

[[Category:Sleep disorders]]
[[Category:Symptoms and signs: Respiratory system]]