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Syncope, also known as fainting, passing out and swooning, is defined as a short loss of consciousness and muscle strength, characterized by a fast onset, short duration, and spontaneous recovery. It is due to a decrease in blood flow to the entire brain usually from low blood pressure.
Well, you can guess that there is a better medical term than passing out, and you'd be correct. A temporary loss of consciousness is referred to as syncope. And it happens when there is a sudden lapse of blood flow to the brain. Your brain doesn't get the blood it needs, and - WHAP! - you've fallen on the floor. Syncope can happen to anyone. A late 90s study showed that as many as 20% of people can experience syncope.