Tachycardia: Would need more history specifically what were you doing To have tachycardia in the past. Heart rate of 120-140 with exercise/fever is not that concerning in a 19 yr old without other symptom or family history. A heart beat of 50-60 is normal especially at rest. If you're having more symptoms, consult with your pcp who may consider a monitor to check heart rate and rhythm.
Answered 11/13/2016
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