Heart palpitations are feelings of a fast-beating, fluttering, or pounding heart. They’re one of the most common symptoms in primary care, accounting for roughly 16% of presenting complaints in general practice. Most of the time they’re harmless, but understanding what causes them and what to watch for can save you unnecessary worry or, in rarer cases, help you recognize when something needs attention.
What Palpitations Feel Like
People describe palpitations in several ways: a heart that’s beating too fast, flip-flopping, fluttering rapidly, pounding, or skipping beats. You might feel them in your chest, but many people notice them in the throat or neck instead. The sensation can last a few seconds or go on for minutes, and it often feels more alarming than it actually is.
Palpitations aren’t a single condition. They’re a symptom, a conscious awareness of your heartbeat that you wouldn’t normally notice. Your heart may genuinely be beating irregularly, or it may be beating normally and you’re simply feeling it more intensely than usual because of stress, caffeine, or other triggers.
Common Triggers
The most frequently reported triggers among people who experience palpitations are alcohol, caffeine, exercise, and lack of sleep. Stress and anxiety sit high on the list too. Nicotine from smoking can heighten the risk of irregular heart rhythms, as can certain medications like decongestants and some asthma inhalers.
Caffeine gets blamed more than it probably deserves. Health guidelines generally recommend capping intake at about 400 mg per day (roughly four standard cups of brewed coffee), and research actually suggests that moderate, habitual coffee drinkers may have a lower risk of atrial fibrillation than people who drink very little. That said, if you personally notice palpitations after your second espresso, your body is telling you something worth listening to. Individual sensitivity varies widely.
Dehydration, skipping meals (which can drop blood sugar), and intense physical exertion can all bring on palpitations in otherwise healthy people. So can hormonal shifts during menstruation, pregnancy, or menopause.
Medical Conditions Behind Palpitations
When palpitations aren’t caused by lifestyle factors, a range of medical conditions can be responsible. These fall into three broad categories.
Heart rhythm problems (arrhythmias) are the most direct cardiac cause. These include premature beats (extra beats that feel like a skip), supraventricular tachycardia (a sudden episode of rapid heartbeat originating above the lower chambers), atrial fibrillation or flutter (chaotic or overly fast signals in the upper chambers), and, less commonly, ventricular tachycardia (a fast rhythm starting in the lower chambers, which is more serious).
Other heart conditions can also produce palpitations without a true arrhythmia. Valve problems like mitral valve prolapse, heart failure, inflammation of the sac around the heart (pericarditis), and certain congenital heart defects all belong in this category.
Non-heart causes account for a significant share of cases. An overactive thyroid gland speeds up metabolism and heart rate. Anemia reduces oxygen delivery, forcing the heart to compensate by beating harder. Electrolyte imbalances, particularly low potassium or magnesium, can destabilize the heart’s electrical system. Fever, low blood sugar, and low blood volume from dehydration round out the list. Anxiety deserves special mention here because it triggers the release of stress hormones that directly increase heart rate, creating palpitations that feel identical to cardiac ones.
Anxiety Palpitations vs. Heart Rhythm Problems
One of the most common questions people have is whether their palpitations are “just anxiety” or something more concerning. A few patterns help distinguish them, though only testing can confirm a diagnosis.
Palpitations tied to anxiety tend to happen in clearly stressful or tense situations. Your heart beats fast but in a steady, regular pattern, and it gradually slows back to normal as you calm down. You may also feel nausea, sweating, or a tight chest. Palpitations from atrial fibrillation, by contrast, produce a very erratic, disorganized heartbeat rather than just a fast one. Episodes of atrial fibrillation also tend to last longer and don’t necessarily line up with emotional stress. People over 65 and those with pre-existing heart or thyroid conditions are more likely to experience atrial fibrillation than younger, otherwise healthy people.
How Palpitations Are Diagnosed
The challenge with palpitations is that they’re often gone by the time you’re sitting in a doctor’s office. A standard electrocardiogram (ECG) records your heart’s electrical activity, but only captures what’s happening in that moment. If your palpitations are infrequent, your doctor may have you wear a portable heart monitor for 24 to 48 hours, or even longer with a small event recorder that you activate when symptoms strike.
Blood tests play a supporting role. A complete blood count checks for anemia or infection. Electrolyte levels can reveal imbalances in potassium, magnesium, or calcium. A thyroid hormone test screens for an overactive or underactive thyroid. These tests help rule out the non-cardiac causes that can mimic or trigger rhythm problems.
Your doctor will also ask detailed questions: how often palpitations happen, how long they last, whether they start and stop suddenly or gradually, and whether anything specific seems to trigger them. Keeping a brief log of episodes, including what you were doing, eating, or drinking at the time, makes this conversation much more productive.
Managing Palpitations
For the majority of people whose palpitations are benign, management centers on identifying and reducing triggers. That might mean cutting back on caffeine or alcohol, improving sleep habits, staying hydrated, and managing stress through regular exercise or relaxation techniques. These changes alone resolve palpitations for many people.
When palpitations strike in the moment, a technique called a vagal maneuver can sometimes slow your heart rate. The most common version is the Valsalva maneuver: you bear down as if you’re having a bowel movement and hold for 15 to 30 seconds. This activates the vagus nerve, which acts as a brake on your heart’s electrical system. Vagal maneuvers are considered a first-line treatment for supraventricular tachycardia and have a 20% to 40% success rate at restoring a normal rhythm during an episode. They’re low-risk for most people, though you should avoid them if you’re experiencing chest pain, shortness of breath, or very low blood pressure.
When an underlying condition is identified, treatment targets that condition. An overactive thyroid, for instance, is treated with medication that normalizes hormone levels, and the palpitations resolve as a result. Anemia is corrected with iron supplementation or by addressing the cause of blood loss. For arrhythmias that are persistent or symptomatic, doctors may prescribe medications that stabilize heart rhythm or, in some cases, recommend a procedure to correct the electrical pathway causing the problem.
Red Flags That Need Urgent Attention
Most palpitations are not emergencies, but certain accompanying symptoms change the picture. A sudden collapse or loss of consciousness is the clearest signal to get emergency care immediately. Palpitations paired with dizziness or lightheadedness also warrant a trip to the emergency department, as they can indicate the heart isn’t pumping enough blood to the brain.
Chest pain alongside palpitations is another red flag that may require urgent evaluation. And if you have a family history of sudden cardiac death at a young age, or a known inherited heart condition in your family, bring this up with your doctor even if your palpitations seem mild. That family history raises the stakes and may prompt earlier or more thorough testing than would otherwise be standard.