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A member asked:
Hr 75 laying, 120 when up! feels muscle weakness and lightheaded, off balance. no anemia, no thyroid prob., no dehydration, ekg normal, no diabetes :/?
A doctor has provided 1 answer
Orthostatic: If you heart rate increases that much when you sit up, the most common cause is dehydration. There are other less common causes, including adrenal insufficiency and autonomic neuropathy. You should see a doctor.
Answered 11/27/2015
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