PHOENIX, July 11 (Phoenix Times Online) — A resting pulse can be more than a fitness number. For most adults, the American Heart Association, Harvard Health, Cleveland Clinic, the British Heart Foundation and Yale Medicine say a normal resting heart rate is 60 to 100 beats per minute. Those same sources say a resting rate above 100 beats per minute is usually called tachycardia, or a fast heart rate.
Why it matters
Medical groups say a fast resting pulse is not a diagnosis by itself, but it can be a clue. The American Heart Association says a fast resting rate can be linked to heart problems such as heart disease, heart attack-related heart muscle damage, heart failure, severe bleeding or very low blood pressure. It also lists nonheart causes including anemia, dehydration, chronic lung disease and too much caffeine.
Harvard Health says clinicians usually do not worry unless the resting heart rate stays above 100 beats per minute. Yale Medicine cardiologist Srijan Shrestha, MD, says a high resting rate may come with palpitations, shortness of breath, dizziness or lightheadedness, but some people have no symptoms at all.
Common causes doctors look for
Several medical groups say a fast resting pulse can be caused by temporary stress, anxiety, fever, infection, caffeine or other stimulants, poor physical conditioning, pregnancy and some medications. The British Heart Foundation and Cleveland Clinic also list overactive thyroid, or hyperthyroidism, as a cause.
Shrestha said anemia can be related to menstruation and blood loss. In older adults, she said, it may come from small gastrointestinal bleeds or colon cancer. Yale Medicine says doctors may treat the underlying problem, such as iron supplements for anemia or medication for hyperthyroidism.
How to check it
Yale Medicine says a resting pulse can be checked at the wrist, inside the elbow, neck or top of the foot. The clinic says to count for 15 seconds and multiply by four, or count for 30 seconds and multiply by two if the rhythm seems irregular. A full minute gives the most complete count.
When to ask a doctor
If a fast resting pulse is only occasional and has an obvious cause, such as caffeine or stress, the source materials say it may not be urgent. But if the rate stays above 100 beats per minute at rest without a clear reason, Harvard Health says it is worth medical attention.
The main takeaway from the medical guidance is simple: a resting heart rate is one small number, but if it stays high, it can be the body’s way of saying something else needs a closer look.
