Is a Resting Heart Rate of 90 Bad?

What does a resting heart rate of 90 mean?

Your resting heart rate is how often your heart beats when you are calm, seated or lying down, and have not been active for a while. The American Heart Association and Mayo Clinic both describe 60 to 100 BPM as normal for adults. Mayo Clinic adds that a lower resting rate generally implies more efficient heart function and better cardiovascular fitness.

That means 90 is “normal” in the sense that it does not count as tachycardia, the term for a resting rate above 100. It does not mean 90 is as good as 65. Think of the range as wide, with healthier, fitter hearts tending toward the lower half.

Here is a rough way to read where 90 sits:

Resting heart rate	How it is usually described
Under 60	Below the textbook range; common in fit people, see our guide to a resting heart rate of 55
60 to 80	Comfortably normal for most adults
81 to 100	High-normal; worth tracking, especially if it is your usual
Over 100	Tachycardia; talk to a doctor if it happens at rest

For a full breakdown by age, see what is a normal resting heart rate.

Is a resting heart rate of 90 bad for your health?

A single reading of 90 says very little. A resting rate that stays around 90 over months is a different matter.

In the Copenhagen Male Study, researchers followed 2,798 middle-aged men for 16 years. Men with a resting heart rate above 90 had about three times the risk of death compared with men at 50 or below, even after accounting for physical fitness, activity level and other risk factors. Overall, risk rose about 16 percent for every 10 BPM increase. A 2016 meta-analysis in the CMAJ found a similar pattern across the general population.

These are observational studies. They show an association, not that a fast heart rate causes harm by itself, and they describe groups rather than any one person. Still, they explain why many clinicians see a persistently high-normal resting rate as a useful signal to look at fitness, sleep and overall cardiovascular health.

What causes a resting heart rate of 90?

Most of the time the cause is temporary and easy to spot. The heart speeds up in response to what the body is dealing with.

Short-term causes

• Caffeine and nicotine. Coffee, energy drinks, pre-workout products and smoking or vaping all raise heart rate.
• Dehydration. Less fluid in the blood vessels means the heart beats faster to keep blood moving.
• Fever or infection. Heart rate rises with body temperature, and even a mild cold can push your resting number up for several days.
• Poor sleep or alcohol. A short night or drinks the evening before commonly raise the next morning’s resting rate.
• Stress and anxiety. The fight-or-flight response speeds the heart, sometimes for hours.
• Heat. Hot weather and hot rooms raise heart rate as the body works to cool itself.
• Medicines. Decongestants, some asthma inhalers, some ADHD medicines and thyroid hormone can all raise heart rate. Do not stop or change any medicine without talking to your prescriber.

Longer-term causes

• Low fitness. A less conditioned heart pumps less blood per beat, so it beats more often at rest.
• Pregnancy. Resting heart rate normally rises during pregnancy as blood volume increases.
• Medical conditions. An overactive thyroid, anemia, sleep apnea, and some heart and lung conditions can raise resting heart rate. Only a clinician can sort these out, usually with an exam, an ECG and blood tests.

How to check whether 90 is really your resting heart rate

Many readings of 90 turn out to be “not quite resting.” Walking to a chair, talking, or measuring right after coffee can add 10 to 20 beats easily. Get a clean baseline before you worry.

1. Measure in the morning, before caffeine, after sitting quietly for five minutes.
2. Breathe normally and stay still. Avoid talking during the reading.
3. Use the same method every time. With Pulse Tracker, place your fingertip over the iPhone camera for about 30 seconds. The app shows a live pulse wave and a measurement quality score, so you can tell a clean reading from a shaky one.
4. Repeat daily for a week and look at the average, not the highest value.
5. Note what else happened that day, such as a late night, alcohol or a cold. Pulse Tracker saves mood and notes with each reading and compares results with your 30-day personal baseline, which makes patterns easier to see.

If your weekly morning average is closer to 75 and the 90s only show up after coffee or stress, your resting heart rate is fine. If the average really is around 90, that is useful information to bring to your doctor. Tracking heart rate variability alongside it can also show whether stress and recovery are part of the picture.

How can you lower a resting heart rate of 90?

If a clinician has confirmed there is no underlying problem, everyday habits make a real difference over weeks to months.

• Aerobic exercise. Regular brisk walking, cycling, swimming or running is the most reliable way to bring resting heart rate down.
• Sleep. Aim for consistent, sufficient sleep. Resting rate often drops after a few good nights.
• Hydration. Drink enough fluid, especially in heat or when ill.
• Less caffeine and alcohol. Cut back and see whether your morning number moves.
• No smoking. Quitting lowers heart rate along with many other benefits.
• Stress management. Slow breathing exercises can calm the nervous system in the moment and may help over time.

Check with your doctor before starting a new exercise program if you have a heart condition, high blood pressure or other health concerns.

When should you see a doctor about a heart rate of 90?

Book a routine appointment if:

• Your resting heart rate stays around 90 or higher for more than a couple of weeks.
• It has climbed noticeably from your usual number without a clear reason.
• You also notice unexplained weight loss, heat intolerance, shakiness, tiredness or trouble exercising.
• You often feel your heart racing, pounding or skipping.

Call emergency services (911 in the US) if a fast heart rate comes with chest pain or pressure, severe shortness of breath, fainting or near-fainting, sudden weakness, or confusion. Do not wait to recheck a reading in those situations.

Sources

• American Heart Association, All About Heart Rate (Pulse)
• Mayo Clinic, What’s a normal resting heart rate?
• Mayo Clinic, Tachycardia: Symptoms and causes
• Jensen MT, Suadicani P, Hein HO, Gyntelberg F. Elevated resting heart rate, physical fitness and all-cause mortality: a 16-year follow-up in the Copenhagen Male Study. Heart, 2013.
• Zhang D, Shen X, Qi X. Resting heart rate and all-cause and cardiovascular mortality in the general population: a meta-analysis. CMAJ, 2016.

Related: Normal resting heart rate by age · Is a Resting Heart Rate of 55 Good? · What is HRV and what is a good number? · How to measure heart rate on iPhone

Wellness disclaimer. Pulse Tracker is intended for general wellness use only. It is not a medical device, is not FDA cleared or approved, and is not intended to diagnose, treat, cure or prevent any disease or condition. Blood pressure shown in the app is either a value you entered from your own cuff or an estimate derived from the pulse signal after cuff calibration; it is not a measurement and must not be used to make medical decisions. Read the full wellness disclaimer. Camera readings, estimates and classifications are for general information only and can be affected by movement, lighting, skin temperature and other factors. Do not use them to diagnose, treat or make decisions about a medical condition. Always consult a qualified healthcare professional, and call emergency services if you have chest pain, shortness of breath, fainting or other urgent symptoms.