A resting heart rate above 100 beats per minute (bpm) is considered high for adults, a condition called tachycardia. The normal range for anyone 13 and older is 60 to 100 bpm, though well-trained athletes often sit in the 40s or 50s. If your heart rate consistently runs at the upper end of that range or above it, something is driving it there, and it’s worth figuring out what.
How to Get an Accurate Reading
Before assuming your heart rate is truly elevated all the time, make sure you’re measuring it correctly. Small details in timing and position can skew your numbers significantly. Harvard Health recommends avoiding measurement within one to two hours after exercise or a stressful event, since your heart rate stays elevated after both. You should also wait at least an hour after consuming caffeine. And don’t take a reading after sitting or standing in one position for a long stretch, as that can also throw off the number.
Take your pulse a few times and average the results. The best moment is first thing in the morning, before you get out of bed, when your body is closest to a true resting state. If you’re relying on a smartwatch, spot-check it occasionally against a manual pulse count at your wrist or neck for 30 seconds (then multiply by two).
Common Lifestyle Causes
The simplest explanations are often the right ones. Caffeine, nicotine, stress, poor sleep, and alcohol can all push your resting heart rate higher. Caffeine in particular is a stimulant that directly speeds up electrical signaling in the heart. If you drink several cups of coffee or energy drinks throughout the day, your “resting” heart rate may never actually reach rest.
Chronic stress and anxiety deserve special attention because they don’t come and go the way a cup of coffee does. When you’re anxious, your body releases stress hormones that raise your heart rate and blood pressure. If that anxiety is constant, the elevated heart rate is too. Johns Hopkins Medicine notes that chronic anxiety puts extra strain on the heart over time, contributing to increased blood pressure, reduced heart rate variability, and a higher risk of heart problems down the road. This isn’t a harmless quirk. Persistent stress-driven tachycardia is worth addressing on its own.
Dehydration is another overlooked cause. When your blood volume drops, your heart compensates by beating faster to maintain circulation. If you’re not drinking enough water, especially in warm weather or during exercise, your heart rate will reflect it.
Medical Conditions That Raise Heart Rate
When lifestyle factors don’t explain your numbers, several medical conditions can keep your heart rate persistently elevated.
Anemia reduces the oxygen-carrying capacity of your blood. Your heart speeds up to compensate, trying to deliver the same amount of oxygen with fewer red blood cells. This is one of the most common medical causes of a chronically fast pulse, especially in women with heavy periods or people with iron-poor diets.
Hyperthyroidism occurs when your thyroid gland produces too much hormone, essentially putting your metabolism into overdrive. A fast heart rate is one of the hallmark symptoms, often alongside weight loss, heat intolerance, and trembling hands.
POTS (postural orthostatic tachycardia syndrome) causes your heart rate to spike dramatically when you stand up. If your heart rate jumps 30 or more bpm within 10 minutes of standing, and this happens repeatedly, POTS may be the reason. It’s particularly common in younger women and often follows a viral illness.
Fever and infection raise heart rate as your immune system ramps up. For every degree Fahrenheit of fever, your heart rate typically increases by about 10 bpm. A lingering low-grade infection can keep your pulse elevated for weeks.
Heart rhythm disorders (arrhythmias) involve the heart’s electrical system misfiring. Some types cause brief episodes of racing, while others produce a sustained fast rate. These range from harmless to serious, which is why persistent tachycardia warrants investigation.
Medications That Speed Up Your Heart
Several common medications can raise heart rate as a side effect. According to an American Heart Association scientific statement, the main culprits include:
- Asthma inhalers and bronchodilators: Albuterol and similar rescue inhalers stimulate the same receptors that adrenaline does, which speeds up the heart.
- Decongestants: Pseudoephedrine and phenylephrine, found in many cold and sinus products, constrict blood vessels and increase heart rate.
- Stimulant medications: Drugs used for ADHD (like methylphenidate) work by boosting nervous system activity, and your heart feels that too.
- Some antidepressants: Certain SSRIs and older tricyclic antidepressants can affect heart rhythm and rate.
- Antipsychotic medications: Several drugs in this class are associated with elevated heart rate.
- Caffeine and energy supplements: These act as stimulants and are formally recognized as contributors to multiple types of fast heart rhythms.
If you started a new medication around the time your heart rate crept up, that connection is worth discussing with whoever prescribed it. Don’t stop a medication on your own, but do flag the timing.
Anxiety, Panic Attacks, and Heart Symptoms
Anxiety and heart problems can look almost identical from the inside. Panic attacks produce chest tightness, a racing heart, dizziness, and shortness of breath, which are the same symptoms as some cardiac events. Johns Hopkins notes that a cardiologist can sort out panic symptoms from heart attack symptoms through a blood test that checks for specific heart muscle enzymes. If those enzymes aren’t present, it’s typically not a heart attack.
This overlap matters because people with anxiety sometimes dismiss real cardiac symptoms as “just anxiety,” and people with undiagnosed anxiety sometimes end up in the emergency room convinced they’re having a heart attack. Neither situation is ideal. If you’ve never had your heart evaluated and you’re experiencing a chronically fast rate alongside anxiety, getting a baseline cardiac workup (usually an EKG and basic blood work) gives you and your doctor something concrete to work with. From there, if the heart checks out structurally, treating the anxiety itself often brings the heart rate down.
Quick Techniques to Slow Your Heart Rate
Vagal maneuvers are physical actions that stimulate the vagus nerve, which runs from your brainstem to your abdomen and plays a major role in slowing your heart. These techniques work by activating your body’s “rest and digest” system to counteract a racing pulse.
The simplest is the Valsalva maneuver: lie on your back, take a deep breath, then try to exhale forcefully with your mouth and nose closed for 10 to 30 seconds. It should feel like blowing hard into a blocked straw. The diving reflex is another option: take a few deep breaths, hold one, and submerge your face in a bowl of ice water for as long as you can tolerate. Even pressing an ice-cold wet towel against your face can trigger the same reflex.
These techniques are useful for episodes of sudden rapid heart rate. They won’t fix a chronically elevated resting rate caused by an underlying condition, but they can help you feel more in control when your heart starts racing unexpectedly.
What a Persistently High Heart Rate Means Long Term
A resting heart rate that stays elevated isn’t just uncomfortable. Over months and years, it forces your heart to work harder than it needs to. Chronic tachycardia can contribute to weakening of the heart muscle, higher blood pressure, and increased cardiovascular risk. The heart is a muscle, and like any muscle asked to work at a relentless pace, it can wear down.
The good news is that most causes of a persistently fast heart rate are treatable. Correcting anemia, managing thyroid levels, reducing caffeine, treating anxiety, adjusting medications, or improving sleep can each bring meaningful reductions. Even moderate aerobic exercise, done consistently, strengthens the heart so it pumps more blood per beat and doesn’t need to beat as often at rest. Many people who start a regular walking or cycling routine see their resting heart rate drop by 5 to 15 bpm over a few months.
If your resting heart rate is consistently above 100 bpm and you can’t explain it with caffeine, stress, or recent activity, that’s a number worth investigating. And if you ever experience chest pain, fainting, severe dizziness, or trouble breathing alongside a fast heart rate, that combination needs immediate attention.