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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):
Dizziness from Sudden or Prolonged Standing. 1  What You Should Know: Standing up quickly is the most common cause of dizziness. 2  Standing - Pump Legs: In the mornings, sit up for a few minutes before you stand up. 3  Salt - Increase Intake : Most people with this type of dizziness due to standing don't get enough salt.