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www.zocdoc.com/answers/6095/when-i-got-blood-taken-out-of-me-why-did-i-pass-out

This often happens in the setting of having blood drawn, but doesn't physically have to do with the amount of blood taken; it is usually just the sight of the blood and needle (especially in someone who hasn't had their blood taken before). Blood pressure and heart rate usually rapidly recover in these circumstances. A small ...

www.health.vic.gov.au/edfactsheets/downloads/fainting-and-collapse.pdf

Heat, emotional distress or pain can cause a faint. Other triggers include standing for a long time, the sight of blood or an alarming event. People who faint are often young and otherwise healthy. Another type of collapse is postural hypotension. This can happen when you stand up quickly, particularly if you have been sitting  ...

www.psychology24.org/a-guide-to-preventing-and-dealing-with-fainting

Mar 25, 2016 ... Why Do We Faint? Fainting The main cause of fainting is due to a reduction in blood travelling to the brain. Blood flow in the body is regulated by the autonomic ... Often people faint from external factors such as pain or an unpleasant sight; many people commonly faint from the sight of blood for instance.

www.medicalnewstoday.com/articles/182524.php

Dec 1, 2017 ... Find out what causes it and what to do if someone faints. ... Some medications: Diuretics, beta-blockers and anti-hypertensive drugs may cause orthostatic hypotension in some people. ... If the sight or thought of injections or blood make a person feel faint, they should tell the doctor or nurse beforehand.

www.ragusea.com/page1/page16/index.php?id=120624172417

Jun 3, 2015 ... I also do not have any classic phobias, no irrational fears, though research suggests people with BII are at higher risk for other phobias. Another way in ... When most people think of BII, they typically expect a person to faint in response to the sight of blood, not the sound of a heartbeat. In reality, whether the ...

www.thesf.org.uk/documents/Emotional-Health/3820_Overcoming%20your%20fear%20of%20needles%20VER1.pdf

For many people, fear of needles is linked to fainting or feeling faint. When the fear is triggered. (for example by seeing blood or thinking about an injection), heart rate and blood pressure increase (as with other kinds of fears), but then rapidly drop. It is this fall in blood pressure that can cause fainting. Many people do not ...

bottomlineinc.com/health/heart/fainting-tell-dangerous

Oct 13, 2016 ... An estimated 90% of people who go to a hospital emergency department after fainting do not have a serious condition that caused it. ... Susceptible people can faint at the sight of blood or after having blood drawn…during an emotional shock or surprise…or when in a warm, crowded place. Once a person ...

www.eurekalert.org/pub_releases/1996-07/OU-RPWW-210796.php

Jul 21, 1996 ... Researchers at Ohio University have found a way to predict which people may feel faint or nauseated while giving blood, allowing workers in blood ... Prevention techniques could include reclining a donor's chair during the donation or talking with donors to distract them from needles or the sight of blood.

articles.latimes.com/2002/mar/11/health/he-boosters11

Mar 11, 2002 ... Sometimes people faint because they're overstimulated: by the sight of blood, distressing news, an emotional moment. The same co-worker who passed out in church also fainted after becoming overwhelmed with sympathy while watching a movie about a man with a terrible disfigurement. The mind does ...