Why Do You Get Severe Headaches When You Stand up?

Answer

Having severe headaches when you stand up can be due to many things. One reason may be due to the fact that the blood pressure is lower while sitting, and when standing up suddenly the blood needs a moment to adjust making you light headed. Another reason may be more serious such as severely high blood pressure, and you should consult a doctor.
Reference:
Q&A Related to "Why Do You Get Severe Headaches When You Stand..."
Simple answer, Gravity. When standing up, the force of your blood goes down, to your extremeties, thus, with the loss of very little blood in your head, you get minor headaches, but
http://wiki.answers.com/Q/Why_do_you_get_severe_he...
The two most common symptoms of anemia are fatigue
http://www.chacha.com/question/what-causes-fatigue...
You are dehydrated. It happens to me too. Source(s) Drink more water? sorry.
http://answers.yahoo.com/question/index?qid=201206...
I do not know what is causing this and unless I knew what it was for certain, then I would not answer. I strongly urge you to see a doctor. Tell him exactly what you are experiencing
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