For the past several months have been feeling a throbbing sensation in my head when standing up from a sitting position (more so at job). It also happens when I bend down (while doing exercise). Told doctor and he asked if I was drinking enough water (which I am). What is causing this problem?
A throbbing sensation in the head after standing up could be due to so called postural hypotension. Postural hypotension is a functional disorder where neuro-vascular reflexes that control the blood pressure do not function properly. You may want to avoid standing up suddenly.
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