Many things: Dehydration causes low blood pressure. The heart beats faster to compensate. Normal exertion should increase heart rate. Thyroid disease may cause it. And there are many abnormalities of the hearts electrical system that may cause a rapid heart rate. Atral fibrillation is common in your age group.
Answered 7/6/2012
5.7k views
SOB/ rapid HR: Various reasons. You may have to get checked. Especially for pulmonary embolism, or copd, pneumonia etc.
Answered 3/18/2014
5.7k views
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