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Why does my vision gradually go black with sudden dizziness for a few seconds when I suddenly stand up? Is it normal? - Quora
Why do I feel so lightheaded/weak/sick when I am standing (not walking or moving) for more than a couple minutes? - Quora
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Scientists figure out why you don't faint every time you stand up after a century of being baffled | Daily Mail Online
Orthostatic Hypotension: 7 Reasons You May Get Dizzy & Lightheaded When Standing | Houston Methodist On Health
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