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Many times I suddenly feel dizzy when I stand up after sitting. I feel very very week and am not able to stand. But this happens for a very short period of time almost 5 seconds. Why is this?

1 Doctor Answered
Many times I suddenly feel dizzy when I stand up after si...
when you stand up all of asudden blood flows down to legs fast so you feel giddi for awhile Never stand up all of a sudden
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