PHOENIX, July 11 (Phoenix Times Online) — For most adults, a resting heart rate between 60 and 100 beats per minute is considered normal, according to the American Heart Association, Cleveland Clinic, Harvard Health, the British Heart Foundation and Yale Medicine. A resting rate that stays above 100 beats per minute is generally called tachycardia, or a fast heart rate.
That number does not automatically mean a heart emergency. Medical organizations say a higher resting pulse can be linked to stress, anxiety, caffeine, dehydration, fever, pregnancy, poor fitness or certain medicines. It can also point to anemia, infection or an overactive thyroid. The American Heart Association says a fast resting rate can also be associated with heart disease and other heart conditions.
Why doctors pay attention to the number
Harvard Health says clinicians usually do not worry unless the resting heart rate is consistently above 100 beats per minute in otherwise healthy people. Yale Medicine cardiologist Srijan Shrestha, MD, says a fast pulse may come with palpitations, shortness of breath, dizziness or lightheadedness, but it may also cause no symptoms at all.
That is why a single reading matters less than a pattern. A pulse that rises after coffee, stress or a fever is different from a pulse that stays high while the body is truly at rest.
What can cause it
The American Heart Association lists anemia, dehydration, chronic lung disease, excessive caffeine intake, severe bleeding, very low blood pressure, heart attack- or heart failure-related damage to heart muscle, and other heart conditions as possible causes of tachycardia. Harvard Health, Cleveland Clinic and the British Heart Foundation also list infection, overactive thyroid, anxiety and stress among common causes.
Yale Medicine says anemia can be related to menstruation and blood loss. In older adults, Dr. Shrestha says, it may come from small gastrointestinal bleeds or colon cancer. Yale Medicine also says doctors may treat the underlying cause, such as iron supplements for anemia or medication for hyperthyroidism.
How to check your resting pulse
Yale Medicine says a resting pulse can be checked at the wrist, inside the elbow, neck or top of the foot. Count the beats for 15 seconds and multiply by four. If the rhythm seems irregular, count for 30 seconds and multiply by two, or count for a full minute.
When to ask a doctor
Henry Ford Health and Yale Medicine say an unexplained resting heart rate above 100 beats per minute is worth medical review, especially if it keeps happening. Henry Ford Health’s Dr. Keteyian says people should seek care if an RHR above 100 or below 50 cannot be explained by obvious factors such as regular exercise.
For most people, the takeaway is simple: a resting heart rate is a clue, not a diagnosis. A consistently high number can be useful information, but doctors look for the cause before deciding what it means.
