Heart palpitations are extremely common and, in most cases, completely harmless. That fluttering, pounding, or “skipped beat” sensation in your chest can be alarming, but it rarely signals a serious heart problem. Most people experience palpitations at some point in their lives, and the vast majority never need treatment.
What You’re Actually Feeling
When you notice a palpitation, you’re feeling your heart beat in a way you normally don’t. This can show up as a fluttering sensation, a heart that feels like it’s pounding harder than usual, a brief pause followed by a strong thump, or a racing heartbeat that seems to come out of nowhere. These sensations often last just a few seconds, though they can occasionally persist for minutes.
The most common type involves premature beats, where your heart fires an extra beat slightly early, then pauses before the next regular beat. That pause and the stronger beat that follows it create the classic “skipped beat” feeling. Nearly everyone has some of these extra beats throughout the day without ever noticing them. Research published in the American Heart Association’s journal Circulation found that when these premature beats make up less than 5% of your total heartbeats over 24 hours, they’re considered benign and don’t require follow-up. No patients with a burden below 10% developed heart muscle problems in the studies reviewed.
Common Triggers
Palpitations rarely appear without a cause. Even when they feel random, there’s usually a trigger you can identify once you know what to look for:
- Caffeine, alcohol, and nicotine. All three are stimulants to the heart (yes, even alcohol). Chocolate also contains enough caffeine to trigger palpitations in sensitive people.
- Stress, anxiety, and panic. Your body releases adrenaline during emotional stress, which directly speeds up your heart rate and can cause irregular beats.
- Dehydration and electrolyte imbalances. Low levels of potassium, magnesium, or even just not drinking enough water can throw off your heart’s electrical timing.
- Sleep position. Sleeping hunched on your side increases pressure inside your chest, which some people feel as palpitations at night.
- Certain medications. Diet pills and nasal decongestants containing pseudoephedrine are common culprits.
- Heavy meals. Foods high in carbohydrates, sodium, sugar, or fat can provoke palpitations shortly after eating.
- Fever. Even a mild fever raises your heart rate and can make you more aware of your heartbeat.
Hormonal Changes and Palpitations
Hormonal shifts are one of the most overlooked triggers, particularly for women. Big surges in estrogen and progesterone during pregnancy, in the days before a period, or during menopause make palpitations significantly more likely. If you’ve noticed your heart fluttering at predictable times in your cycle, or if palpitations started during perimenopause, the connection is probably hormonal rather than cardiac. These episodes are typically benign, though they can be frequent enough to feel disruptive.
The Role of Magnesium
Magnesium plays a specific role in regulating your heart’s rhythm. It controls the timing of electrical signals as they pass through your heart. When magnesium levels drop too low, those electrical gates open and close faster than they should, speeding up your heartbeat and potentially causing palpitations.
Adults need between 310 and 420 mg of magnesium daily, depending on age and sex. Men over 31 need about 420 mg; women over 31 need about 320 mg. The best sources are pumpkin seeds, chia seeds, almonds, spinach, cashews, peanuts, black beans, and edamame. Getting magnesium from food is generally preferable to supplements, because excess magnesium from pills isn’t easily cleared by your body and can cause diarrhea, low blood pressure, muscle weakness, and impaired kidney function. If you suspect a deficiency, a simple blood test can confirm it before you start supplementing.
When Palpitations Need Attention
Most palpitations don’t require medical care. But certain accompanying symptoms change the picture entirely. Seek emergency care if palpitations come with chest pain lasting more than a few minutes, dizziness or fainting, or significant shortness of breath. These combinations can indicate a heart rhythm problem that needs immediate evaluation.
Palpitations that happen frequently, last longer than a few seconds at a time, or seem to be getting worse over time also warrant a conversation with your doctor, even without those emergency red flags.
How Doctors Evaluate Palpitations
If your doctor wants to investigate further, the process is straightforward and noninvasive. The first step is usually an electrocardiogram (EKG), a quick, painless test where sticky patches on your chest record your heart’s electrical activity. It takes just a few minutes and can show whether your heart is beating too fast, too slow, or irregularly.
The challenge is that palpitations often don’t happen on command. If your EKG looks normal but you’re still having symptoms, you may be asked to wear a Holter monitor, a portable device that records your heart rhythm continuously for a day or more while you go about your normal routine. For palpitations that happen less than once a week, an event recorder works better. You wear it for up to 30 days and press a button when symptoms occur, capturing the rhythm at that exact moment.
In some cases, your doctor may also order an echocardiogram, which uses ultrasound to create a moving picture of your heart. This checks the structure and blood flow to rule out any underlying issues. For the vast majority of people who go through this workup, the results come back reassuringly normal.
Practical Steps to Reduce Palpitations
Once you’ve identified your triggers, most palpitations respond well to simple lifestyle changes. Cut back on caffeine and alcohol, even temporarily, to see if your symptoms improve. Stay well hydrated, especially after exercise or a night of drinking. Manage stress through whatever works for you, whether that’s exercise, breathing techniques, or simply reducing your commitments. Make sure your diet includes enough magnesium-rich foods. And if you notice palpitations at night, try changing your sleep position to see if lying on your back makes a difference.
Palpitations that come and go with identifiable triggers, last only seconds, and don’t bring along chest pain or fainting are, in the vast majority of cases, nothing more than your heart doing something slightly unusual that you happened to notice. Unpleasant, yes. Dangerous, almost always no.