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en.wikipedia.org/wiki/Blood_phobia

Blood phobia is extreme and irrational fear of blood, a type of specific phobia. Severe cases of this fear can cause physical reactions that are uncommon in most other fears, specifically vasovagal syncope (fainting). Similar reactions can also occur with trypanophobia and traumatophobia. For this reason, these phobias are ...

www.doceatdoc.com/howtopreventfainting

During my A-levels, when a close friend of mine confided in me that he was thinking about applying for medical school but felt faint at the very sight of blood it got ... students is that whilst most manage to avoid making a fool of themselves, a few cannot help but faint publicly whenever the opportunity to do so presents itself.

www.yalemedicine.org/conditions/syncope

Some people faint from the sight of blood. But it can be caused by serious medical conditions. It's important to get to the root of a fainting incident.

www.foxnews.com/health/2015/06/16/how-to-get-over-being-squeamish-at-sight-blood.html

Jun 16, 2015 ... The sight of blood causes many people to get queasy and lightheaded. They may even pass out.

phlabs.com/why-did-you-pass-out-during-the-blood-draw

Fainting – It can happen to otherwise healthy people! You may feel ... The response is often triggered by anxiety or emotional distress, sometimes even from the sight of blood during a blood draw. This type of ... If you have fainted at a blood draw before, you should ask to do your next blood draw lying down. You can also ...

www.theatlantic.com/health/archive/2017/09/for-the-faint-of-heart/540984

Sep 26, 2017 ... And if you have the type of vasovagal faint which is prone to emotional triggers such as seeing blood or pain, that can certainly evoke fainting in susceptible people.” Shen confirmed that just thinking about something distressing can be enough to cause fainting. The sight of blood is one reported by many ...

www.healthline.com/health-news/why-being-scared-can-make-you-faint

Oct 21, 2017 ... If we don't run away (because our stress is emotional not physical), it adds more blood going to the legs and less to the head and makes someone who is prone to fainting more likely to do so in that circumstance,” Corcoran told Healthline. This may also be the case with the sight of blood, which occurs in 3 ...

docsmith.co/2008/10/why-do-people-freeze-during-stressful-situations-and-faint-at-the-sight-of-blood

Oct 14, 2008 ... Why Do People Freeze During Stressful Situations and Faint at the Sight of Blood ? Q: What's behind the “deer in the headlights” phenomenon? I understand fight or flight is necessary during dangerous situations, but why do people “freeze” when they're scared? It seems like the worst thing to do when your ...

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  ...