Editing Reflex syncope (section)

==Causes==
Reflex syncope occurs in response to a trigger due to dysfunction of the heart rate and blood pressure regulating mechanism. When heart rate slows or blood pressure drops, the resulting lack of blood to the brain causes fainting.<ref>{{cite web |url=http://www.mayoclinic.org/diseases-conditions/vasovagal-syncope/symptoms-causes/dxc-20184778 |title=Vasovagal syncope: Causes |publisher=MayoClinic.com |date=7 August 2010  |access-date=10 August 2016}}</ref>

===Vasovagal===
Typical triggers include:
* Prolonged standing<ref name=NIH2017/>
* Emotional stress<ref name=NIH2017/>
* Pain<ref name=NIH2017/>
* [[Blood phobia|The sight of blood]]<ref name=NIH2017/>
* [[Fear of needles]]<ref name="accurso">{{cite journal |last=Accurso |first=V. |display-authors=etal |date=August 2001 |title=Predisposition to Vasovagal Syncope in Subjects With Blood/Injury Phobia |journal=Circulation |volume=104 |issue=8 |pages=903–907 |doi=10.1161/hc3301.094910 |pmid=11514377 |s2cid=11022384 |doi-access=}} [http://circ.ahajournals.org/cgi/content/full/104/8/903]</ref><ref name="hamilton">{{cite journal | author= James G. Hamilton| title= Needle Phobia - A Neglected Diagnosis | journal= Journal of Family Practice|date=August 1995| volume= 41| issue = 2 | pages = 169–175 REVIEW |pmid = 7636457}}</ref>
* Time varying magnetic field<ref name=Rossi>{{cite journal |vauthors=Rossi S, Hallett M, Rossini PM, Pascual-Leone A |title=Safety, ethical considerations, and application guidelines for the use of transcranial magnetic stimulation in clinical practice and research |journal=Clinical Neurophysiology |volume=120 |issue=12 |pages=2008–2039 |year=2009 |pmid=19833552 |pmc=3260536 |doi=10.1016/j.clinph.2009.08.016|hdl=11572/145680 }}</ref> (i.e. [[transcranial magnetic stimulation]])

===Situational===
* After or during urination ([[micturition syncope]])<ref name=Ad2017/>
* Straining, such as to have a bowel movement<ref name=Ad2017/>
* Coughing<ref name=Ad2017/>
* Swallowing<ref name=Ad2017/>
* Lifting a heavy weight<ref name=Ad2017/>

===Carotid sinus===
Pressing upon a certain spot in the neck.<ref name=NIH2017/> This may happen when wearing a tight collar, shaving, or turning the head.<ref name=NIH2017/>