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this is why you get light headed when you are sitting and stand all of a sudden because when you are sitting your blood tends to pool up in your legs and standing all of a sudden sends a sudden huge burst of a lot of blood to your brain. your brain gets a little oxygen starved when you are sitting. Source(s):
Standing Up too Quickly. When a person changes position suddenly, such as from a reclining or sitting position to standing up, the blood in the head is pulled by gravity into the feet and legs. This abrupt change in blood flow can make the person's blood pressure fall briefly before the body has time to counteract it.