Normally, when people stand, gravity causes blood to pool in the veins of the legs and trunk. This pooling lowers the blood pressure and the amount of blood the heart pumps to the brain.
I think that your blood pressure is very low and when you stand up it drops. So have it checked by medical professionals. If you are taking blood pressure medication make sure you don't overdose. This will also cause a drop in your blood pressure. Hope this will help you.
Barring any medical conditions, it's the result of blood rushing from your head due to the changing pressures in your cardio system. If this happens often though, you should seek a medical opinion.
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