An extra heartbeat is almost always a premature beat, where your heart fires an electrical signal slightly ahead of schedule. These are among the most common heart rhythm irregularities, and the vast majority are harmless. Nearly everyone experiences them at some point, often without noticing. That said, the frequency and context matter, and understanding what’s behind them can help you figure out whether yours deserve attention.
Why Your Heart Fires Early
Your heart has a built-in pacemaker, a cluster of cells that sends a steady electrical pulse to keep your heart beating in rhythm. An extra beat happens when a different spot in the heart generates its own electrical signal before the pacemaker fires its next one. Think of it as a musician in an orchestra jumping ahead of the conductor by half a beat. The heart contracts slightly early, then pauses briefly before resuming its normal rhythm. That pause is what creates the “skipped beat” sensation, even though you actually had an extra one.
These premature beats come in two main types depending on where in the heart they originate. If the early signal comes from one of the upper chambers, it’s called a premature atrial contraction (PAC). If it comes from one of the lower chambers, it’s a premature ventricular contraction (PVC). PVCs tend to produce a stronger, more noticeable thump because the lower chambers are responsible for pumping blood out to the body. PACs are generally subtler. Both are typically benign on their own.
What It Actually Feels Like
People describe extra heartbeats in a lot of different ways. You might feel a flip-flopping sensation in your chest, a sudden thud or pound, a brief flutter, or the distinct feeling that your heart skipped a beat entirely. Some people feel them in their throat or neck. Others only notice them when lying on their left side at night, when the heart is closer to the chest wall and sensations are amplified.
The intensity varies widely from person to person. Some people feel every single extra beat and find it distressing. Others have thousands per day and never notice. How much they bother you doesn’t necessarily correlate with how significant they are medically.
Common Triggers
Extra heartbeats often have identifiable triggers. The most common include:
- Caffeine and other stimulants, including nicotine, cocaine, and methamphetamines
- Alcohol, particularly in larger amounts
- Stress and anxiety, which raise adrenaline levels
- Exercise, especially intense or unfamiliar exertion
- Sleep deprivation and fatigue
- Electrolyte imbalances, particularly low potassium or magnesium
Adrenaline plays a central role. Anything that ramps up your body’s fight-or-flight response, whether it’s a stressful day at work or a hard workout, can make the heart more electrically excitable and prone to firing early signals. This is why many people notice extra beats during anxious periods and then worry about them, which creates more adrenaline, which creates more extra beats.
Low potassium and magnesium have long been suspected as culprits, though research suggests the relationship is more nuanced than commonly believed. A study of 103 patients in a coronary care unit found mild deficiencies of both minerals in roughly 18 to 24 percent of patients, but the link between those mild deficiencies and triggering arrhythmias wasn’t strong. Severe deficiencies are a different story and can destabilize heart rhythm more meaningfully.
When Extra Beats Are Harmless
If you have an otherwise healthy heart, occasional extra beats are not dangerous. The key factors that determine whether extra heartbeats need attention are your symptom burden, how frequently they occur, and whether you have any underlying heart disease.
A cardiologist evaluating extra beats looks at something called PVC burden: the percentage of your total heartbeats in a day that are premature. Your heart beats roughly 100,000 times per day, and having a small fraction of those be premature is completely normal. When the burden is low, your heart’s pumping function is normal, and no underlying condition is found, reassurance alone is often the only “treatment” needed.
When They Become Concerning
Extra beats start to matter when they’re very frequent. A PVC burden of 10 percent or more (roughly 10,000 extra beats per day) is the threshold where doctors begin investigating whether the extra beats could be weakening the heart muscle over time. One large study found that burdens of 24 percent or higher with a consistent pattern were associated with a high risk of developing a form of heart muscle weakening called cardiomyopathy. Current guidelines recommend considering treatment when the burden exceeds 15 percent and heart function shows signs of decline.
For extra beats originating in the upper chambers (PACs), high frequency carries a different concern. Frequent PACs, roughly 30 or more per hour, have been independently associated with an increased risk of developing atrial fibrillation, a condition where the upper chambers beat chaotically. Atrial fibrillation itself raises stroke risk, which is why frequent PACs sometimes warrant monitoring even when they feel minor.
Certain symptoms alongside extra beats signal that something more serious may be happening. Chest pain, shortness of breath, or fainting paired with palpitations require emergency evaluation. These combinations can indicate a dangerous arrhythmia like ventricular tachycardia, particularly in people with existing heart disease.
How Extra Beats Are Diagnosed
A standard electrocardiogram (EKG) captures your heart’s electrical activity for about 10 seconds. That’s enough to catch extra beats if they’re happening frequently at that moment, but many people have intermittent episodes that a quick snapshot will miss.
For intermittent symptoms, doctors use longer-term monitors. The traditional approach is a 24-hour Holter monitor, a portable device you wear for a full day. However, its sensitivity for catching occasional arrhythmias is limited. If your extra beats happen only a few times a week, 24 hours may not be enough. Newer adhesive patch monitors can record continuously for up to 14 days, capturing episodes during sleep, exercise, and daily life that a single-day recording would miss. Studies comparing the two found that the 14-day patches were significantly more effective at detecting intermittent rhythm problems.
Once your doctor has a recording of your extra beats, the shape of the electrical signal on the tracing tells them exactly where the premature impulse originated and whether it follows a pattern that suggests anything beyond a benign quirk.
Treatment Options
For most people, managing extra heartbeats starts with lifestyle changes: cutting back on caffeine, reducing alcohol, improving sleep, and managing stress. These steps alone eliminate the problem for many people.
When extra beats remain frequent and bothersome after reassurance and lifestyle adjustments, treatment decisions depend heavily on patient preference. In someone with a structurally normal heart, the goal of treatment is improving quality of life, not preventing a medical emergency. Doctors will sometimes ask directly whether the symptoms are bothersome enough to try medication or a procedure, even if the extra beats pose no danger. If the answer is yes, two main options exist.
Medication can reduce the frequency of extra beats and ease symptoms. A catheter-based procedure called ablation offers a more targeted approach: a thin wire is guided to the exact spot in the heart generating the premature signals, and that tissue is carefully treated to stop it from firing. Both are considered reasonable first options, and the choice often comes down to personal preference and how well someone tolerates medication. For people whose extra beats are causing the heart to weaken (typically at high burdens), ablation tends to be particularly effective and can reverse the damage if the extra beats were the primary cause.
Yearly monitoring is recommended if your PVC burden reaches 8 percent or higher, even if you feel fine, since the burden can increase over time and begin affecting heart function.