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"Fainting is a sudden (and generally momentary) loss of consciousness, or blacking out, due to a lack of sufficient blood and oxygen reaching the brain. The first symptoms a person feels before fainting are dizziness, a dimming of vision, or brown-out and feeling hot. Moments later, the person's vision turns black and he or she drops to the floor (or slumps if seated in a chair).
Factors that influence fainting are taking in too little food and fluids, low blood pressure, hypoglycemia, growth spurts, physical exercise in excess of the energy reserve of the body, and lack of sleep. Even standing up too quickly or being in too hot a room can cause fainting."
http://en.wikipedia.org/wiki/Fainting
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You're reading Why do people faint? What happens in their bodies that cause them to collapse?
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I think I almost fainted today. Thing happened just like you said, only the last part didn't "vision turns black" and falling to the floor. It lasted for about 5 min and then I was ok again like nothing happened.
by Katee on January 29th, 2008