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A member asked:
What exactly does it take to fall unconscious?
A doctor has provided 1 answer
Unconsciousness: Falling unconscious most often happens as a faint. The most common cause of faint is what is called a "vasovagal" reaction in which fright, pain, disgust, horror, or other stimulus triggers the vagus nerve to lower your heart rate until your blood pressure drops too low to maintain normal cerebral consciousness. The other major cause of fainting is just low blood pressure, eg., dehydration, etc.
Answered 12/21/2014
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