Most heart palpitations are harmless and pass within seconds or minutes. They become concerning when they last longer than a few minutes, happen alongside other symptoms like chest pain or fainting, or start appearing for the first time later in life. Knowing the difference between a benign flutter and something worth investigating can save you unnecessary worry or, in rarer cases, help you act fast when it matters.
Symptoms That Need Emergency Attention
Certain combinations of symptoms push palpitations from “probably fine” to “call 911.” If your palpitations come with chest pain or pressure, fainting or near-fainting, severe shortness of breath, or intense dizziness, treat it as an emergency. These can signal a dangerous heart rhythm disturbance that needs immediate evaluation, not a wait-and-see approach.
Loss of consciousness during palpitations is especially serious. One type of rapid heart rhythm that originates in the lower chambers of the heart can cause fainting and, in people with underlying heart disease, cardiac arrest. That’s the worst-case scenario and not the norm, but it’s the reason fainting plus palpitations always warrants urgent care.
Duration and Heart Rate Thresholds
If your palpitations resolve on their own within a few minutes and you feel fine otherwise, they’re generally not dangerous. But palpitations that continue for an hour or more, even without other symptoms, should be evaluated by a doctor. That kind of sustained irregularity suggests something beyond a momentary blip.
Heart rate matters too. A resting heart rate above 110 beats per minute can indicate an arrhythmia and is worth getting checked. You can measure this yourself by placing two fingers on the inside of your wrist and counting beats for 15 seconds, then multiplying by four. If your heart is racing that fast at rest, especially for more than a few minutes, contact your doctor.
Age and New-Onset Palpitations
Palpitations that appear suddenly in older adults deserve prompt medical attention, particularly if you’ve never experienced them before. Younger people who’ve had occasional skipped beats since their teens or twenties are in a different category than a 65-year-old feeling them for the first time. New-onset palpitations at an older age are more likely to reflect a structural or electrical change in the heart that needs investigation.
What Your Palpitations Feel Like Matters
Not all palpitations are the same sensation, and the specific feeling you experience gives your doctor useful diagnostic clues. Cardiologists at Johns Hopkins describe asking patients to tap out their heartbeat rhythm on a table to distinguish isolated skipped beats from a sustained abnormal rhythm. You can do this yourself to prepare for a medical visit.
The European Heart Rhythm Association classifies palpitations into four patterns. “Skipped beat” or “sinking heart” sensations, where your heart seems to pause and then thump hard, are typically caused by extra beats (called ectopic beats). These are the most common type and usually benign. A rapid fluttering sensation, sometimes described as “beating wings” in the chest, suggests a fast heart rhythm like supraventricular tachycardia. Strong, pounding but regular heartbeats, where you simply feel each beat more forcefully than usual, are often tied to exertion or adrenaline. And palpitations accompanied by a general sense of anxiety or agitation may be driven more by your nervous system than by a heart problem.
Paying attention to whether the rhythm feels regular or chaotic is particularly important. An irregular, erratic rhythm could point to atrial fibrillation, the most common sustained arrhythmia, which can interfere with blood flow and increase the risk of stroke.
Common Harmless Triggers
Before assuming the worst, consider what might be provoking your palpitations. The most common non-cardiac triggers include caffeine, dehydration, low blood sugar, strong emotions (stress, anxiety, anger, even a sudden surprise), and physical activity. Electrolyte imbalances, particularly low potassium, magnesium, or calcium, can also disrupt your heart’s electrical signals. Vomiting, heavy sweating, or not eating enough can all deplete these minerals.
If you can trace your palpitations to a clear trigger, like your third cup of coffee or a stressful meeting, and they stop within minutes, they’re almost certainly not dangerous. Cutting back on the trigger and mentioning it at your next routine checkup is enough. The concern escalates when palpitations happen without an obvious cause, won’t stop on their own, or keep recurring despite removing known triggers.
Arrhythmias Linked to Palpitations
When palpitations do reflect a heart rhythm problem, a few conditions account for most cases. Supraventricular tachycardia causes the heart to beat very quickly or erratically, originating above the lower chambers. People often notice a rapid pulse and dizziness. It’s usually not life-threatening but can be disruptive and may need treatment.
Atrial fibrillation produces a rapid, irregular heartbeat. Some people feel obvious palpitations and chest tightness, while others have no symptoms at all and only discover it during a routine exam. The main risk with atrial fibrillation isn’t the palpitations themselves but the potential for blood clots and stroke, which is why detection matters even when symptoms are mild.
Ventricular tachycardia is less common but more serious. This fast rhythm originates in the heart’s lower chambers and, when associated with structural heart disease, can cause loss of consciousness or cardiac arrest. This is the type most likely to produce the emergency red-flag symptoms described above.
What Happens at the Doctor’s Office
If your palpitations warrant evaluation, the first step is almost always a standard electrocardiogram, which records your heart’s electrical activity for about 10 seconds. The challenge is that palpitations are often intermittent, so a normal result doesn’t rule everything out.
For palpitations that come and go, your doctor may have you wear a Holter monitor, a portable device that records your heart rhythm continuously for 24 hours or more. If your episodes are even less frequent, a cardiac event recorder can be worn for a month or two using patches, wristbands, or finger clips. When you feel palpitations, you press a button (or the device detects the irregularity automatically), and the recording is transmitted to your doctor for analysis.
Smartwatches and Home Monitoring
Consumer wearable devices have become surprisingly accurate at detecting certain arrhythmias. A 2025 systematic review found that devices like the Apple Watch and KardiaMobile achieved sensitivities of 83% to 100% and specificities of 79% to 100% for detecting atrial fibrillation, compared against a standard 12-lead ECG. One study of 122 patients found that all tested devices (Apple Watch, KardiaMobile, and two smartphone apps) reached 100% sensitivity for atrial fibrillation when a good-quality recording was captured.
That said, these results come from controlled clinical settings. Real-world accuracy depends on proper device placement, a clean recording, and having a doctor interpret the result. A smartwatch alert is a reasonable reason to schedule an appointment, but it’s not a substitute for formal diagnosis. Conversely, a smartwatch that shows normal sinus rhythm during your palpitations is genuinely reassuring information you can share with your doctor.
A Quick Self-Check Before Your Appointment
If you’re experiencing palpitations and trying to decide whether to seek care, run through these questions: Do they last more than a few minutes? Is your heart rate above 110 at rest? Are they accompanied by chest pain, fainting, or significant shortness of breath? Have they started suddenly at an older age without any prior history? Do they happen without an obvious trigger like caffeine or stress?
If you answered yes to any of those, a medical evaluation is warranted. If your palpitations are brief, triggered by something identifiable, and resolve on their own, tracking the pattern and discussing it at your next routine visit is a reasonable approach. In either case, try tapping out the rhythm you feel on a table or recording it on your phone. That small detail can help your doctor narrow down the cause faster than almost anything else you describe.