Adrenaline?: Heart pounding at rates below 100-110 usually is from adrenaline rather than a heart problem. The body can overproduce adrenaline due to anxiety, lack of sleep, or other stress, or a medical issue like anemia or overactive thyroid. Anxiety-related beating tends to be worse at night when everything is quiet & people start listen to their heart. If it goes away when you are busy, that's a good sign!
Answered 7/15/2013
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