Why do people get dizzy when they stand up?

Question

Why do some people get really dizzy and see black spots when they stand up? (What causes this?)

I have never really expirienced this before, and now every time I stand up, I get dizzy and my vision goes grey/black and fuzzy.

Is it because I'm tired or not eating enough?

Answer 1

True, this is called orthostatic hypotension. What this translates to is that when you are sitting and then stand up quickly, not enough blood is pumped to your brain at first, causing this episode. I'm not sure that it is related to being tired or not eating enough...

Answer 2

this is orthostatic hypotention