Tachycardia : The heart rate can change depending on activity. It can also be abnormal from a problem in the heart or outside the heart. For example, someone is dehydrated in the morning and takes a shower, that dehydration can cause the heart to beat faster in reaction to the loss of fluids. Patients drinking coffee or an energy drink can have a raised heart rate. See your doctor.
Answered 3/25/2019
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