Many possible causes: Most common reason is being out of shape. When body isn't accustomed to activity, it struggles to keep up. Persistent &gradual increase in activity results in better conditioning &slower heart rate. Other causes are caffeine &other stimulants, dehydration, hyperactive thyroid, abnormal heart rhythms, &dysautonomia. These usually cause higher than normal heart rate at rest too. Talk to your doctor.
Answered 8/19/2014
3.8k views
3 doctors weighed in across 2 answers
A doctor has provided 1 answer
A doctor has provided 1 answer
3 doctors weighed in across 2 answers
7 doctors weighed in across 2 answers
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question