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julie78787 t1_j9hni3r wrote

Reply to comment by Key-Regular674 in LPT: If you’re anemic or get headrush when you stand, do a quick squat, going down as low as you comfortably can, and stand back up. Your head will be completely fine in <2 seconds. by micknanuel

It's not a blood oxygenation problem. My O2 saturation is usually 98 percent.

There's an autonomic response to standing which can be defective in some people. When someone with that problem stands, the blood pressure in their skull rapidly declines. When the blood pressure in the skull is too low, O2 can't exchange with CO2.

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