Dehydration: most of the time is dehydration. you need to drink a lot of water,which it does not have any calories,dizziness with changing position,are dure to change in the heart rate and the blood pressure,which will effect the perfusion of blood into the brain,and the person will passed out. the other possibility in low blood sugar,but that has nothing to do with changing position keep happenning see a doc
Answered 4/13/2015
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