Questions tagged [syncope]

Syncope (also known as fainting or passing out) is defined as a loss of consciousness due to a decrease in blood flow to the brain. Common causes are vasovagal response (when the body overreacts to certain emotional triggers, such as the sight of blood) and cardiac dysrhythmias (irregular heart rate).

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What's the term for fainting when you get a needle without apprehension?

So I will often faint when I get a needle, both for vaccinations and blood tests. This is not because I have any apprehension about the needle. If I lie down for the needle rather than sitting it has ...
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Why is the likelihood of fainting after the Johnson & Johnson's COVID-19 Vaccine 163 times higher than the likelihood of fainting after flu vaccine?

I read on https://www.cdc.gov/coronavirus/2019-ncov/vaccines/different-vaccines/janssen.html (mirror): Fainting After Vaccination Fainting (syncope) and other events that may be related to anxiety ...
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Is it right to say that any syncope is a result of low perfusion to brain?

Is it right to say that always syncope is a result of low perfusion to brain, or low blood pressure? (I know that there are a lot of secondary reasons such as vassovagal or cardiac issues, but if I ...
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Techniques to avoid fainting when observing a surgery

I wonder what techniques can efficiently help avoid fainting when observing a surgery, either directly from the operating room, or video.
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Is fainting more common in young men during blood lettings, and if so, why?

I recently underwent a blood test, and during the third vial I passed out. I awoke just as the sixth was being finished and could not immediately stand. The vials were small, only 5ml each if I ...
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Fainted history in both myself and my father. Can it be related?

I am a twenty five year old male, pretty fit, no known conditions. I fainted last night for a few seconds and although I will get it checked out, it has to wait for a week or two so I thought I'd get ...
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