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en.wikipedia.org/wiki/Reflex_syncope

When people lose consciousness, they fall down (unless prevented from doing so) and, when in this position, effective blood flow to the brain is immediately restored, allowing the person to regain consciousness. If the person does not fall into a fully flat, supine position, and the head remains elevated above the trunk, ...

www.mayoclinic.org/diseases-conditions/vasovagal-syncope/symptoms-causes/syc-20350527

Aug 4, 2017 ... Overview. Vasovagal syncope (vay-zoh-VAY-gul SING-kuh-pee) occurs when you faint because your body overreacts to certain triggers, such as the sight of blood or extreme emotional distress. It may also be called neurocardiogenic syncope. The vasovagal syncope trigger causes your heart rate and ...

www.gainesonbrains.com/2013/02/fainting-at-sight-of-blood.html

Feb 17, 2013 ... Do you get woozy when you see blood? It seems like ... As it turns out, fainting at the sight of blood may be a primitive reflex buried deep in our brain. Fainting, or ... The brain's hardwired reactions to stress have a lot of implications for teachers, students, soldiers, police, people with even mild social anxiety.

www.advisory.com/daily-briefing/2016/05/02/why-some-people-faint

May 2, 2016 ... If you find yourself in a cold sweat just thinking about your annual flu shot, you can blame evolution, Cynthia Murray writes in The Conversation.

www.huffingtonpost.com/entry/should-you-go-to-the-doctor-after-fainting_us_577d7a7ae4b0344d514ddb1d

Jul 7, 2016 ... How do you know if you're supposed to see a doctor after fainting? For most cases of syncope, it will be obvious what triggered the fainting spell: heat, dehydration, standing for long periods of time, or the sight of blood. Still, no matter what the trigger, if it's the first time someone has fainted, he or she should  ...

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 a spot in the “ Diagnostic and Statistical Manual of Mental Disorders,” psychiatrists' principal reference book. A physical response to the sight of blood is totally ...

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

Mar 10, 2011 ... we alllokked sureprised, because it was just a bit of blood, but looking at her face it was clear that she was feeling faint. The one who cut herself wen into the backroom together a bandage, and the other one gradually got her colour back. So, why do some people get faint at the sight of a little blood, while for ...

www.reddit.com/r/explainlikeimfive/comments/32wmi8/eli5_why_do_some_people_faint_because_they_saw

Apr 17, 2015 ... AKA "fight or flight" which releases catecholamines such as epinephrine ( adrenaline), raising heart rate and blood pressure, and gearing the body up for survival. For certain people, visually seeing blood or gore can cause the parasympathetic nervous system to take over instead; causing a polar opposite ...

m.kidshealth.org/en/teens/fainting.html

Why Do People Faint? Fainting is pretty common in teens. The good news is that most of the time it's not a sign of something serious. SYNCOPE ,fainting. When someone faints, it's usually ... This is the reason why people faint when something frightens or horrifies them, like the sight of blood. Hyperventilation. A person who ...