A palpitation is the sensation of your heart beating in a way you can actually feel. Normally, you’re unaware of your heartbeat. During a palpitation, the beat becomes noticeable, whether it feels like a flutter, a thud, a racing sensation, or a brief skip. Palpitations can be felt in your chest, throat, or neck, and while they’re startling, they’re one of the most common cardiac complaints and usually harmless.
What Palpitations Feel Like
People describe palpitations in several distinct ways. Some feel a rapid fluttering, like a bird trapped in the chest. Others notice a hard, pounding beat that seems louder or stronger than normal. A common variety is the “skipped beat” sensation, which is actually an extra beat followed by a longer-than-usual pause before the next one. That pause is what creates the unsettling feeling that your heart momentarily stopped. Some people describe a flip-flopping sensation, as though the heart is turning over in the chest.
Palpitations can last a fraction of a second or persist for minutes. They can happen once and never return, or they can occur in clusters over weeks or months. The experience itself is subjective: two people with the exact same heart rhythm can differ in whether they notice it at all.
What’s Happening Inside Your Heart
The most common source of palpitations is a premature beat, either from the upper chambers of the heart or the lower chambers. These early beats fire from a spot outside the heart’s normal pacemaker. The heart contracts slightly ahead of schedule, then pauses a beat longer than usual before resuming its regular rhythm. That pause allows the chambers to fill with more blood, so the next beat is stronger than normal. It’s that forceful contraction you actually feel.
Several things can trigger these premature beats. The heart’s electrical cells can become more excitable when stimulated by stress hormones, caffeine, or shifts in electrolytes like potassium and magnesium. In some cases, a small electrical loop forms in heart tissue, causing a signal to circle back on itself and fire an extra impulse. These mechanisms sound technical, but the practical takeaway is simple: a premature beat is usually a glitch in timing, not a sign of damage.
Common Triggers
Caffeine is the trigger people ask about most, and the research is more reassuring than you’d expect. Studies show that moderate coffee intake (up to about 400 mg of caffeine per day, or roughly four standard cups) does not increase the risk of dangerous heart rhythms. In fact, one large analysis found that people who drank less than two cups per day actually had a higher rate of atrial fibrillation than those who drank more. The risk of atrial fibrillation dropped by about 6% for every additional 300 mg of daily caffeine. That said, if you personally notice palpitations after coffee, your body may be more sensitive to its stimulating effects regardless of what population studies show.
Alcohol is a well-known trigger, particularly for atrial fibrillation. It’s one of the most commonly self-reported triggers among people with symptomatic episodes. Nicotine from smoking or vaping also raises the risk, though specific thresholds haven’t been pinned down in research. Other everyday triggers include dehydration, poor sleep, intense exercise, and fever.
Stress, Anxiety, and the Brain’s Role
Palpitations and anxiety are deeply intertwined, and the connection goes both directions. Anxiety triggers the release of stress hormones that speed the heart and make it more reactive. But research in neurocardiology suggests the brain also plays a more direct role. People with panic disorder appear to have more sensitive receptors for norepinephrine, one of the body’s primary stress chemicals. In studies, compounds that increase norepinephrine levels in the brain produced significantly more palpitations in people with panic disorder than in those without it.
Brain imaging studies show that palpitations activate the same regions involved in sensing your body’s internal state: the insular cortex and the anterior cingulate cortex. These same areas light up during anxious states. This overlap helps explain why anxious people are more likely to notice and be distressed by heartbeat irregularities that others wouldn’t even feel. The palpitation itself may be identical, but the brain amplifies the signal.
Hormonal and Medical Causes
Thyroid disorders are a classic medical cause. An overactive thyroid floods the body with hormones that increase heart rate and contractility, making palpitations frequent and sometimes persistent. Hormonal shifts during menopause, pregnancy, and menstruation can also trigger episodes, likely through their effects on the cardiovascular system’s sensitivity to adrenaline. Anemia is another overlooked cause: when the blood carries less oxygen, the heart compensates by beating faster and harder, which you may feel as pounding or racing.
When Palpitations Signal Something Serious
Most palpitations are benign, but certain features raise the possibility of a serious rhythm disorder. The red flags to be aware of include:
- Fainting or near-fainting, especially if you injure yourself during the episode
- Chest pain or shortness of breath occurring alongside the palpitations
- A resting heart rate above 120 beats per minute or below 45
- A new, irregular rhythm that feels chaotic rather than just fast
- Known heart disease or a family history of sudden cardiac death
Palpitations paired with dizziness, significant fatigue, or chest pain deserve prompt medical attention. A single skipped beat that resolves on its own and leaves you feeling fine is a very different situation from a sustained racing episode that makes you lightheaded.
How Palpitations Are Diagnosed
The challenge with palpitations is catching them in the act. A standard electrocardiogram (EKG) records your heart’s electrical activity for about 10 seconds. If you’re having palpitations at that exact moment, the EKG will capture the rhythm. If you’re not, the results will look perfectly normal.
For palpitations that come and go, a Holter monitor is typically the next step. This is a small, portable device you wear for 24 to 48 hours that continuously records your heart rhythm while you go about your daily routine. If your symptoms are less frequent, happening only a few times a month, an event monitor or an implantable loop recorder may be used instead. Event monitors can be worn for weeks, and loop recorders are tiny devices placed under the skin that can record for years. The choice depends entirely on how often your episodes occur.
Stopping an Episode at Home
If you experience a sudden racing heartbeat (not just a skipped beat), a technique called the Valsalva maneuver can sometimes reset your heart rhythm. It works by stimulating the vagus nerve, which acts as a brake on heart rate. Here’s how to do it:
- Sit down or lie on your back.
- Take a breath in.
- Close your mouth and pinch your nose shut, then bear down as if you’re straining to have a bowel movement.
- Hold for 15 to 20 seconds.
- Release and breathe out normally.
A modified version involves lying flat and having someone lift your legs immediately after you stop straining, which improves the technique’s success rate. If three attempts don’t break the episode, medical treatment is the next step. Other simple vagal maneuvers include splashing cold water on your face or coughing forcefully, both of which can nudge the heart back into its normal rhythm.
For palpitations caused by premature beats rather than sustained fast rhythms, reducing caffeine, alcohol, and nicotine, managing stress, staying hydrated, and getting adequate sleep are the interventions that make the most consistent difference. When palpitations are frequent enough to interfere with quality of life, medications that calm the heart’s electrical activity can be effective.