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As you stand up the amount of blood getting to you brain decreases as the pressure moves to the bottom of you body. There are a few reasons for this, POSTURAL HYPOTENSION is one thing that could cause it in really bad cases. Unless it happens all the time and lasts longer than a second you shouldn't need to worry about this though.

I'll try and explain it so its easier to understand. If you have a tube with liquid in it and you lie it on its side, the pressure is spread evenly from one end to the other, but as you stand it up, the pressure of the liquid goes to the bottom. This is what your blood does, and the faint headed blackout is that brief moment as your body adjusts. I hope that's a good enough explanation.

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Wiki User

14y ago
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Wiki User

16y ago

Quote from related link (http://en.wikipedia.org/wiki/Orthostatic_hypotension):

Orthostatic hypotension (also known as postural hypotension, orthostatic intolerance and, colloquially, as head rush or a dizzy spell) is a sudden fall in blood pressure, typically greater than 20/10 mm Hg, that occurs when a person assumes a standing position, usually after a prolonged period of rest.

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Wiki User

15y ago

You may be low on protein and/or your blood sugar could be high or low. This doesn't necessarily mean your diabetic but you may want to want to watch the things you eat. Be sure to consult a doctor if this persists.

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Brayden Villarreal

Lvl 2
4y ago

its becuase something called Orthostatic hypotension a sudden fall in blood pressure that occurs when you stand up to fast Hypotension is the term for low blood pressure if offten starts happening when your not drinking enough water or just when your blood pressure is low

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Wiki User

11y ago

You may feel dizzy because you have stayed in one position for a period of time then when stand up the body is not used to the position so you may feel dizzy

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Wiki User

13y ago

That you should lay back down. If your head feels odd when you stand up, you probably have a fever.

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