Look for a cause: Rapid heart rate is not a cardiac condition by itself. It usually is a sign of something else. Common causes include fever, pain, anxiety, infection, anemia, overactive thyroid, use of stimulants (caffeine, decongestants) or certain medications. If you cannot identify a cause, you may want to discuss with your local physician about getting an ekg or a 24-hour holter monitor.
Answered 3/15/2016
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