Quick answer: heart palpitations are the sensation of your own heartbeat — racing, pounding, fluttering, skipping, or irregular — felt in the chest, throat or neck. The large majority are benign, caused by anxiety, caffeine, fatigue, dehydration, or isolated extra beats that are entirely normal. A smaller but important minority reflect an underlying arrhythmia that needs evaluation and treatment. The goal of this guide is helping you tell the two apart — and knowing which warning signs mean seek care promptly rather than wait.
Warning Signs That Need Prompt Evaluation
Certain features raise the likelihood of a significant arrhythmia and mean don’t wait for a routine appointment:
- Palpitations with fainting or near-fainting
- Palpitations with significant chest pain or pressure
- Palpitations with severe breathlessness
- Palpitations alongside known structural heart disease (heart failure, prior heart attack, cardiomyopathy)
- Palpitations that start during exercise rather than at rest
- A family history of sudden cardiac death, especially in a young relative
- Palpitations that are sustained — lasting minutes to hours — rather than a brief isolated sensation
Any of these, especially with fainting or chest pain, warrants emergency evaluation rather than a scheduled appointment.
What Palpitations Actually Are
Palpitations are among the most common cardiac complaints seen by general practitioners and cardiologists — accounting for a substantial share of cardiology outpatient visits. The clinical reality is that the large majority are benign, caused by isolated extra beats, anxiety, caffeine, fatigue, or dehydration. The clinical task is separating that majority from the smaller group with a meaningful underlying arrhythmia, without over-investigating everyone or missing the cases that matter.
Common Benign Causes
Ectopic beats (premature contractions)
Premature atrial and ventricular contractions (PACs and PVCs) are the most common cause of palpitations, occur in virtually everyone at some point, and are usually benign. The heart fires an extra beat slightly early, followed by a compensatory pause — felt as a “skipped beat” or “heart flip.” They increase with caffeine, alcohol, stress, fatigue and stimulants. In people without structural heart disease, isolated ectopic beats need no treatment beyond reassurance and addressing the trigger.
Anxiety and panic disorder
Anxiety is both a cause and an amplifier of palpitations. Sympathetic nervous system activation raises heart rate and increases awareness of cardiac sensations — many people with anxiety notice heartbeats that others simply don’t register. A panic attack can produce a racing heart, palpitations and chest tightness that closely mimic a serious cardiac event.
Caffeine and stimulants
Coffee, energy drinks, and some over-the-counter stimulant supplements can trigger palpitations in a dose-dependent way. A trial period of reduced caffeine intake helps many people identify this as the cause.
Dehydration and electrolyte imbalance
Dehydration and low magnesium or potassium levels increase cardiac irritability and ectopic beat frequency. Inadequate fluid intake during hot weather or after heavy exercise is a common and easily addressable trigger.
Anemia
Iron deficiency anemia causes compensatory sinus tachycardia — a faster resting heart rate — that many people experience as persistent palpitation, particularly on exertion. A simple blood count often reveals the cause.
Thyroid disorders
Hyperthyroidism produces a faster heart rate and increased cardiac contractility, commonly presenting as palpitations alongside weight loss, heat intolerance and anxiety. Hypothyroidism can cause a different pattern of palpitation. A thyroid function test (TSH) is a standard part of the palpitation workup.
Arrhythmias That Can Cause Palpitations
Atrial fibrillation (AFib)
An irregular, often rapid heartbeat from chaotic electrical activity in the upper chambers, described as “irregularly irregular” — no discernible pattern. The most important arrhythmia to identify because of its stroke risk. It becomes more common with age and with hypertension, diabetes and untreated sleep apnea.
Supraventricular tachycardia (SVT)
A sudden-onset, rapid, regular heartbeat (roughly 150 to 250 beats per minute) that stops as suddenly as it starts — often felt as an abrupt “switch” in the chest lasting minutes to hours. More common in younger people. Often manageable with vagal maneuvers (such as the Valsalva technique) or, definitively, with catheter ablation — a highly effective curative procedure.
Ventricular tachycardia (VT)
A rapid, regular heartbeat originating in the ventricles — more serious than SVT, particularly alongside existing structural heart disease. Can compromise blood flow and requires urgent evaluation.
Diagnostic Workup
- 12-lead ECG — captures heart rhythm at the moment of recording; most useful if symptoms are present during the test
- 24-hour Holter monitor — captures rhythm over a full day, increasing the chance of recording a symptomatic episode
- Blood tests — complete blood count (anemia), thyroid function, electrolytes, fasting glucose
- Echocardiogram — if structural heart disease is suspected
Longer-duration event monitors (7 to 30 days) or implantable loop recorders are used when symptoms are infrequent and standard monitoring fails to capture an episode.
When No Cause Is Found
A meaningful share of palpitation workups come back entirely normal — no arrhythmia captured, normal echocardiogram, normal blood work. In this situation, anxiety-related palpitations and heightened awareness of one’s own heartbeat are the most likely explanation. Reassurance based on a genuinely negative evaluation is itself therapeutic. Cognitive behavioral therapy for health anxiety, cutting caffeine, adequate sleep and regular aerobic exercise typically bring substantial improvement.
Frequently Asked Questions
Worry, and seek prompt evaluation, if palpitations come with fainting, chest pain or pressure, severe breathlessness, occur alongside known structural heart disease, start during exercise, follow a family history of sudden cardiac death, or last minutes to hours rather than a few seconds. Brief, isolated palpitations without these features are usually benign.
Ectopic beats — premature atrial or ventricular contractions — are the most common cause, occurring in virtually everyone at some point and usually harmless. Anxiety, caffeine, dehydration and fatigue are the other most frequent triggers.
Yes. Anxiety activates the sympathetic nervous system, which raises heart rate and increases awareness of cardiac sensations. A panic attack in particular can produce a racing heart and chest tightness that closely resembles a cardiac event, which is why anxiety-related palpitations still deserve a proper evaluation rather than being assumed without testing.
A 12-lead ECG, a 24-hour Holter monitor, blood tests (complete blood count, thyroid function, electrolytes, glucose), and an echocardiogram if structural heart disease is suspected. Longer event monitors or implantable loop recorders are used when symptoms are too infrequent for standard monitoring to catch.
Sources
- Giada F, Gulizia M. (2009). Management of patients with palpitations. Europace, 11(7), 920–934.
- Barsky AJ. (2001). Palpitations, arrhythmias, and awareness of cardiac activity. Annals of Internal Medicine, 134(9 Pt 2), 832–837.
- Zimetbaum P, Josephson ME. (1998). Evaluation of patients with palpitations. NEJM, 338(19), 1369–1373.
- American Heart Association — Palpitations.
Last updated: August 2026. This article is general information and is not medical advice or a diagnosis. If palpitations come with fainting, chest pain or severe breathlessness, call emergency services rather than reading further.
