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When I stand up or sit down too quickly this happens to me, so I know what you mean. You may be hypoglycemic or have hypo/hypertension. If it happens often I would talk to a doctor.

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If it is only a passing event triggered by standing up rapidly, with no other signs of anything wrong, it is most likely due to the rapid standing slightly, temporarily dropping blood pressure to the brain.

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Q: Why do you see black spots and pass out when you stand up?
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