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People faint because for a brief moment, enough oxygen was not getting to their brain

Let them lie down a bit so blood returns to their brain
Raise their legs above the level of their heart
Loosen their belt or belly trimmer. Stop watering them, they're not plants
A sudden emotional experience like fear can lead to fainting because the body triggers a response that for a brief moment, lowers their blood pressure so that not enough blood is going to the brain.

The falling is the body's way of getting the brain to the level of the heart
Raise their legs above the level of the heart to force more blood back to the brain.

It takes a few moments to get conscious again.

Low blood sugar can also lead to it
Dehydration, extreme exercise(This happened to me)

Severe pain can cause people to faint also
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