Can Coffee Cause Heart Palpitations? What Research Says

You finish a big mug of coffee, sit down at your desk and suddenly notice your heartbeat: a flutter, a thud, a skipped beat. It is unsettling, and it raises an obvious question: can coffee cause heart palpitations? For some people, yes, it can contribute to that sensation. But recent research is more reassuring than many expect: in large studies, regular coffee drinking has not been linked to a higher risk of heart rhythm disorders, and one randomized trial found coffee increased one type of extra beat but not another.

Here is what the evidence actually shows, who tends to be more sensitive, and when palpitations deserve a call to your doctor.

Key takeaways

• Palpitations are the feeling of your heartbeat being noticeable, fast, pounding or irregular. They are common and often harmless, but they can have medical causes.
• In the 2023 CRAVE randomized trial, coffee days were not linked to more extra beats from the upper heart chambers, but were linked to about 50 percent more extra beats from the lower chambers.
• A UK Biobank study of 386,258 people found each additional daily cup was associated with a 3 percent lower risk of arrhythmia. That is an association, not proof of cause.
• Dose, timing, sleep, stress, alcohol and individual sensitivity all matter. Most healthy adults can have up to 400 mg of caffeine a day, according to the FDA and EFSA.

In this article

1. What palpitations are
2. Can coffee cause heart palpitations?
3. What the main studies found
4. Why some people feel it more
5. Practical ways to cut the jitters
6. When to see a doctor
7. FAQ

What palpitations are

Palpitations describe a sensation, not a diagnosis. People describe them as fluttering, pounding, racing or a heartbeat that seems to skip. Common triggers include exercise, stress and anxiety, lack of sleep, alcohol, nicotine, dehydration and certain medicines, as well as caffeine. Less often, they reflect an underlying heart rhythm problem or another condition such as an overactive thyroid or anemia.

Many “skipped beats” are premature contractions, which are early heartbeats followed by a slight pause. There are two kinds:

• Premature atrial contractions (PACs) start in the upper chambers (atria).
• Premature ventricular contractions (PVCs) start in the lower chambers (ventricles).

Both are common in healthy people, and most are never noticed. The distinction matters because research on coffee found different results for each.

Can coffee cause heart palpitations?

Caffeine is a stimulant. It blocks adenosine, a chemical that promotes calm and sleepiness, and it can raise adrenaline levels in the short term. In some people that shows up as a faster or more noticeable heartbeat, especially after a large dose, on an empty stomach or after a bad night’s sleep.

So coffee can contribute to the feeling of palpitations. The more important question is whether it causes harmful heart rhythms, and that is where research gets interesting.

What the main studies found

How to read these results

• Short-term vs long-term. The CRAVE trial measured what happens on the day you drink coffee. The observational studies looked at habits over years. Both can be true: a cup may bring a few more extra beats today, while regular coffee drinkers as a group do not show more arrhythmias.
• Extra beats are not the same as disease. In otherwise healthy hearts, occasional PVCs are usually benign. In people with existing heart disease, doctors may view them differently, which is why personal advice matters.
• Association is not causation. The UK Biobank result does not prove coffee protects the heart; coffee drinkers may differ in other ways.
• Who was studied. CRAVE participants were relatively young and healthy, and people with atrial fibrillation or heart failure were excluded.

Why some people feel it more

Caffeine affects people differently. Factors that can make palpitations more likely include:

• Dose: One large energy-drink-sized hit is different from a small espresso. Our guide to how much caffeine is in coffee compares common drinks.
• Speed: Drinking quickly produces a sharper peak than sipping over an hour.
• Sleep loss and stress: Both raise adrenaline on their own, and caffeine adds to it.
• Tolerance: Occasional drinkers often feel stronger effects than daily drinkers.
• Other stimulants: Pre-workout powders, energy drinks, decongestants and some supplements stack with coffee.
• Pregnancy and medications: Both can change how caffeine is processed; EFSA advises up to 200 mg a day in pregnancy and breastfeeding.

Practical ways to cut the jitters

1. Track your total. Add up coffee, tea, soda, chocolate and supplements for a few days. Most healthy adults can stay under 400 mg a day, and EFSA considers single doses up to 200 mg unproblematic for most adults.
2. Split big doses. Two small cups a couple of hours apart usually feel gentler than one huge mug.
3. Eat something first. Many people notice stronger effects on an empty stomach.
4. Protect your sleep. Caffeine has a half-life of several hours, so an afternoon cup can still be active at bedtime, and poor sleep makes palpitations more noticeable the next day.
5. Keep a simple diary. Note time, drink, amount, sleep and how you felt. It helps you spot patterns and is useful for your doctor.
6. Taper rather than quit cold turkey. Cutting back gradually helps avoid withdrawal headaches.

Lower-caffeine options that still taste like coffee

If you decide to cut back, you do not have to give up flavor. Our Half Caf blends regular coffee with water-process decaf for about half the caffeine. Peru Decaf is a Swiss Water Process single origin with caramel and citrus notes, and Decaf Espresso is water-process decaf roasted dark for evening shots. Decaf still contains a small amount of caffeine, as explained in our article on caffeine in decaf.

When to see a doctor

Palpitations are often harmless, but get medical advice if they:

• last a long time, keep coming back or get worse
• happen with a known heart condition or a family history of heart problems or sudden death
• worry you, even if they are brief

Seek emergency care right away if palpitations come with chest pain, shortness of breath, fainting or severe dizziness.

A doctor may suggest an ECG or a wearable monitor to see exactly what your heart is doing during an episode. Bring your caffeine diary.

Coffee and palpitations FAQ

How long do caffeine palpitations last?

Caffeine’s effects typically peak within about an hour and fade over several hours as it is cleared, but timing varies widely between people. Palpitations that persist or recur should be checked by a doctor.

Is decaf safe if coffee gives me palpitations?

Decaf contains only a few milligrams of caffeine per cup, so many caffeine-sensitive people tolerate it well. If palpitations continue without caffeine, other causes are worth investigating.

Can coffee trigger atrial fibrillation?

Large observational studies have not found that regular coffee drinkers have higher rates of atrial fibrillation. If you have AFib, ask your cardiologist what is right for you.

Is espresso worse than drip coffee for palpitations?

What matters is the total caffeine and how fast you take it. A single espresso usually has less caffeine than a large mug of drip coffee.

Sources

1. Marcus GM et al. Acute effects of coffee consumption on health among ambulatory adults, New England Journal of Medicine, 2023.
2. Acute Effects of Coffee Consumption on Health (journal scan), American College of Cardiology, 2023.
3. Coffee Doesn’t Raise Your Risk for Heart Rhythm Problems, UCSF, 2021 (on Kim et al., JAMA Internal Medicine).
4. Dixit S et al. Consumption of caffeinated products and cardiac ectopy, Journal of the American Heart Association, 2016.
5. Heart palpitations, NHS.
6. Spilling the Beans: How Much Caffeine Is Too Much?, FDA.
7. Scientific Opinion on the safety of caffeine, EFSA, 2015.

Facts checked in October 2026.

This article is for general information only and is not medical advice. If you have a health condition, are pregnant or take medication, ask your doctor before changing your caffeine intake.

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