Heart palpitations feel like your heart is pounding, fluttering, racing, or skipping beats. You might notice them in your chest, but many people feel them in the neck or throat too. Most episodes are brief and harmless, lasting only seconds to a few minutes before resolving on their own.
How People Describe the Sensation
The word “palpitation” covers a surprisingly wide range of sensations. Some people describe a rapid fluttering, like a bird trapped in the chest. Others feel a hard, forceful pounding they can sense all the way up in their throat. The most common descriptions include racing, pounding, flip-flopping, fluttering, missing a beat, or feeling an extra beat.
That classic “skipped beat” feeling is worth understanding, because the sensation is a bit counterintuitive. What you’re actually feeling isn’t the skipped beat itself. It’s the beat that comes after. When your heart fires a premature contraction (a very common, usually harmless event), there’s a brief pause before the next normal beat. During that pause, the heart fills with more blood than usual. The next contraction then pumps that extra volume out with unusual force. That forceful thump is what registers as the “skip” or “flip-flop” you notice.
Some people barely register their palpitations and only discover them when a doctor points out an irregular rhythm. Others find the sensation intense and alarming, even when the underlying cause is completely benign. How strongly you perceive palpitations varies from person to person and has a lot to do with your baseline level of anxiety and body awareness.
Where You Feel Them
The chest is the most obvious location, but palpitations often show up where you wouldn’t expect. The neck and throat are common spots, especially for the pounding type. This happens because large blood vessels run close to the surface there, and a forceful or irregular heartbeat creates a pulse you can feel (and sometimes see) at the base of the neck. Some people notice them most while lying on their left side at night, when the heart sits closer to the chest wall and each beat is easier to detect.
Common Triggers
Palpitations rarely appear out of nowhere. The most frequent triggers are everyday substances and emotional states, not heart disease. Caffeine, alcohol, reduced sleep, intense exercise, and stress are all well-documented causes. Dehydration, nicotine, certain cold medications containing stimulants, and hormonal shifts (especially during menstruation, pregnancy, or menopause) round out the list.
Stress and anxiety deserve special attention because they create a feedback loop. Anxiety triggers a surge of adrenaline, which speeds the heart rate and can cause premature beats. You notice the palpitation, which makes you more anxious, which triggers more adrenaline. This cycle is why palpitations during a panic attack can feel so dramatic even though the heart itself is structurally fine.
Anxiety-Related vs. Cardiac Palpitations
Palpitations caused by anxiety tend to start suddenly and end quickly. They usually resolve within a few minutes once the stressful moment passes, and they don’t come with symptoms like fainting or prolonged chest pain. You can often trace them to a specific emotional trigger: an argument, a work deadline, a frightening thought.
Palpitations with a cardiac origin behave differently. They may come on without an obvious emotional trigger, last longer (minutes to hours rather than seconds), or feel like a sustained rapid rhythm rather than isolated skips. They’re more likely to bring additional symptoms like dizziness, shortness of breath, or near-fainting. Frequency matters too: palpitations that happen repeatedly throughout the day or that follow a predictable pattern unrelated to stress are more likely to reflect an underlying rhythm problem.
That said, these are general patterns, not hard rules. Some cardiac arrhythmias produce brief, infrequent episodes that feel identical to anxiety-related palpitations. The only way to know for certain what’s causing yours is to capture the rhythm on a monitor during an episode.
How Long Is Normal
Isolated skipped beats or a few seconds of fluttering are extremely common and rarely indicate a problem. Most benign palpitations resolve in under a minute. An arrhythmia is considered sustained if it lasts more than 30 seconds. Supraventricular tachycardia, one of the more common rhythm disturbances in otherwise healthy people, can last anywhere from a few seconds to several hours. Atrial fibrillation episodes typically last up to 24 hours, and an episode lasting more than seven days is classified as persistent.
The key distinction is between palpitations that come in brief, self-limiting bursts and those that settle into a sustained rapid or irregular rhythm. If yours consistently last minutes to hours, that warrants a medical evaluation even if you feel fine otherwise.
Warning Signs That Need Attention
Most palpitations are harmless, but certain accompanying symptoms change the picture. Palpitations paired with chest discomfort, shortness of breath, lightheadedness, dizziness, nausea, or the feeling that you’re about to pass out (or actually passing out) require prompt medical attention. These combinations can signal a more serious arrhythmia or, in rare cases, a heart attack.
Palpitations that last minutes to hours, keep coming back frequently, or begin happening during exertion when they didn’t before also deserve investigation, even without those additional symptoms.
How Palpitations Are Diagnosed
The challenge with diagnosing palpitations is that they’re often gone by the time you’re sitting in a doctor’s office. A standard electrocardiogram (EKG) takes a snapshot of your heart’s electrical activity in real time, so it only catches problems that are happening at that exact moment.
When palpitations come and go, a Holter monitor is more useful. This is a portable device you wear for a day or more while going about your normal life. It continuously records your heart rhythm and can catch irregular beats that a brief office EKG would miss. For palpitations that happen less frequently, an event recorder worn for up to 30 days lets you press a button when symptoms strike, capturing the rhythm at that moment. Many smartwatches now offer basic EKG recording that can serve a similar purpose, giving your doctor a tracing to review.
If structural problems are suspected, an echocardiogram uses ultrasound to create a moving picture of the heart, showing how the valves and chambers are functioning. In most cases, though, the evaluation starts simple: an EKG, some blood work to check thyroid function and electrolytes, and a careful conversation about your symptoms and triggers.