That depends: Almost anyone can get a drop in blood pressure when standing up suddenly if he or she is dehydrated at the time (for example, if it's a warm day and you've forgotten to take in enough fluids) or has had alcohol or a medication that opens up blood vessels (some blood pressure meds). Less frequently, it can be caused by an abnormal response by your nervous system to the change in posture.
Answered 7/21/2013
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