Editing Hallucination (section)

===Olfactory===
{{main|Phantosmia|Parosmia}}
Phantosmia (olfactory hallucinations), smelling an odor that is not actually there,<ref name=NHSphantosmia/> and parosmia (olfactory illusions), inhaling a real odor but perceiving it as different scent than remembered,<ref name=Hong>{{cite journal | vauthors = Hong SC, Holbrook EH, Leopold DA, Hummel T | title = Distorted olfactory perception: a systematic review | journal = Acta Oto-Laryngologica | volume = 132 | issue = S1 | pages = S27–S31 | date = June 2012 | pmid = 22582778 | doi = 10.3109/00016489.2012.659759 | s2cid = 207416134 }}</ref> are distortions to the sense of smell ([[olfactory system]]), and in most cases, are not caused by anything serious and will usually go away on their own in time.<ref name="NHSphantosmia" /> It can result from a range of conditions such as nasal infections, [[nasal polyp]]s, dental problems, migraines, head injuries, [[seizure]]s, strokes, or brain tumors.<ref name=NHSphantosmia/><ref name=Leopold2002>{{cite journal | vauthors = Leopold D | title = Distortion of olfactory perception: diagnosis and treatment | journal = Chemical Senses | volume = 27 | issue = 7 | pages = 611–615 | date = September 2002 | pmid = 12200340 | doi = 10.1093/chemse/27.7.611 | doi-access = free }}</ref> <!-- *-->Environmental exposures can sometimes cause it as well, such as smoking, exposure to certain types of chemicals (e.g., [[insecticide]]s or [[solvent]]s), or radiation treatment for head or neck cancer.<ref name="NHSphantosmia" /> It can also be a symptom of certain [[mental disorder]]s such as [[major depression|depression]], [[bipolar disorder]], intoxication, substance [[drug withdrawal|withdrawal]], or [[psychotic disorder]]s (e.g., [[schizophrenia]]).<ref name=Leopold2002/> The perceived odors are usually unpleasant and commonly described as smelling burned, foul, spoiled, or rotten.<!-- * --><ref name=NHSphantosmia>{{citation|title=Phantosmia (Smelling Odours That Aren't There)|author=HealthUnlocked|website=NHS Choices|year=2014|url=http://www.nhs.uk/conditions/phantosmia/Pages/Introduction.aspx|access-date=6 August 2016|url-status=live|archive-url=https://web.archive.org/web/20160802124224/http://www.nhs.uk/conditions/phantosmia/Pages/Introduction.aspx|archive-date=2 August 2016}}</ref>
<!-- *Text between asterisks was copied from the main article Phantosmia on 6 August 2016. -->