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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):
Being inactive causes circulation problems. Normally when you walk, the blood is pumped back towards your heart and swelling is reduced. Putting your feet up for just ten minutes a day can help - lie down on the sofa and make sure your feet are raised higher than your heart.