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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):
From the WebMD Archives March 19, 2012 -- Blood pressure that drops when a person stands up may signal a higher risk for heart failure, a new study shows. If further research supports the studyâs findings, a simple test that measures blood pressure change as a person gets to their feet may one day help doctors spot heart failure early, when it is most manageable.