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What your body is actually doing when you pass out

Fainting isn't usually a cause for alarm, and the physiological processes in your body that lead to loss of consciousness can ...
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Why People Faint and What They Can Do About It

Fainting happens when your brain doesn’t get enough blood. Dehydration, shock, too much alcohol, and even anxiety can lead to fainting. If you think you’re about to faint, lie down or put your head ...