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www.reddit.com/r/explainlikeimfive/comments/2xdp4g/eli5_why_do_some_people_pass_out_at_the_sight_of

i do this because i am having a vasovagal response. i have this response to other things (getting shots, seeing someone else get an IV ...

www.chop.edu/conditions-diseases/fainting-syncope

Fear, pain, crowded or hot rooms, the sight of blood, or a hot shower can also ... This is very unlikely — most children who faint do not have underlying heart ...

www.ncbi.nlm.nih.gov/pubmed/3413272

A survey was carried out among students, from which 30 volunteers who reported that they felt faint at the sight of blood or injury were recruited, together with 26 ...

www.merckmanuals.com/home/heart-and-blood-vessel-disorders/symptoms-of-heart-and-blood-vessel-disorders/fainting

Less often, people faint suddenly, without any warning symptoms. ... Sometimes, however, blood flow is adequate but the blood does not contain sufficient ... Strong emotion (particularly that triggered by the sight of blood) or pain can activate ...

www.wsj.com/articles/how-to-get-over-being-squeamish-at-the-sight-of-blood-1434389502

Jun 15, 2015 ... The sight of blood causes many people to get queasy and lightheaded. They may even pass out. The phobia is common enough that it earned ...

www.medicinenet.com/fainting/article.htm

Some people faint at the sight of needles or blood, this is referred to as .... Other noxious stimuli can do the same thing, including situational stressors.

www.hopkinsmedicine.org/healthlibrary/conditions/cardiovascular_diseases/syncope_fainting_22,Syncope(Fainting)

Someone who faints should be moved so they are lying down to allow blood to flow to the brain. If they do not regain consciousness promptly, start CPR. ... also have an emotional trigger such as seeing blood ("fainting at the sight of blood").

www.innerbody.com/diseases-conditions/vasovagal-syncope

Oct 3, 2017 ... It almost always goes away on its own, and even people who faint wake up ... Sight of blood, having blood drawn; Intense emotions, including ...

boards.straightdope.com/sdmb/showthread.php?t=600252

Mar 10, 2011 ... So, why do some people get faint at the sight of a little blood, while for others it's just "hmm, you should put a band-aid on that - but can I get my ...