Heart Palpitations — Causes, Evaluation & When to Seek Care — Causes, Diagnosis & When to See a Doctor | MyMedicPlus

Heart palpitations are the uncomfortable and often alarming awareness of one's own heartbeat — perceived as racing, fluttering, pounding, skipping, or flip-flopping sensations, experienced in the chest, throat, or neck, at rest or during activity. They are an extremely common symptom, affecting up to 16% of the general population at some point and accounting for a significant proportion of cardiology referrals and emergency department attendances. The vast majority of palpitations in people without known structural heart disease are caused by benign ectopic beats — premature atrial or ventricular contractions — or by non-cardiac causes such as anxiety, caffeine, alcohol, or anaemia. Despite their alarming quality, benign palpitations in a structurally normal heart carry no increased risk of sudden cardiac death or adverse cardiac events. However, palpitations can also be the presenting symptom of clinically significant arrhythmias including atrial fibrillation (which carries a substantial stroke risk), supraventricular tachycardia (SVT), and ventricular tachycardia — the latter being potentially life-threatening, particularly in the context of structural heart disease or inherited cardiac channelopathies. The challenge and clinical priority in palpitation assessment is to identify the minority of patients with a haemodynamically significant arrhythmia or structural cardiac disease from the much larger majority with benign, self-limiting symptoms that require only reassurance and lifestyle advice.

Benign ectopic beats — premature atrial contractions (PACs) and premature ventricular contractions (PVCs) — are the most common cause of palpitations in the general population. These are extra heartbeats arising from ectopic foci in the atria or ventricles that are followed by a compensatory pause, producing the characteristic 'skipping a beat' or 'flip-flop' sensation as the subsequent normal beat contracts more forcefully after the pause. They are almost universally benign in people with structurally normal hearts, though they can be frequent and distressing. Common non-cardiac triggers include caffeine (coffee, tea, energy drinks, cola) which lowers the ectopic beat threshold; alcohol, particularly in binge-drinking episodes (holiday heart syndrome); nicotine and stimulant recreational drugs; anxiety, stress, and panic disorder — anxiety activates the sympathetic nervous system, increasing heart rate, ectopic beat frequency, and the perception of normal beats; dehydration; and sleep deprivation. Important cardiac arrhythmias causing palpitations include: atrial fibrillation (AF) — an irregularly irregular rapid rhythm arising from chaotic atrial electrical activity, affecting 2–4% of the general population and 10–17% of those over 65, and associated with a 5-fold increased stroke risk; supraventricular tachycardia (SVT) — a rapid regular tachycardia (140–280 beats per minute) of sudden onset and offset, typically AVNRT or AVRT mechanisms, causing palpitations, dizziness, and rarely presyncope; atrial flutter — a regular rapid atrial tachycardia at approximately 300 bpm, typically conducted 2:1 giving a ventricular rate of approximately 150 bpm; ventricular tachycardia (VT) — life-threatening when sustained (more than 30 seconds), particularly in the context of structural heart disease such as ischaemic cardiomyopathy, hypertrophic cardiomyopathy, or arrhythmogenic right ventricular cardiomyopathy (ARVC). Medical causes include hyperthyroidism (thyroid hormone drives sinus tachycardia and increases ectopic beat frequency); anaemia (causes compensatory sinus tachycardia); fever; and electrolyte imbalances — hypokalaemia and hypomagnesaemia lower the cardiac action potential threshold and precipitate arrhythmias, particularly in patients on diuretics or with malnutrition. Medications that cause palpitations include decongestants (pseudoephedrine), stimulant ADHD medications (methylphenidate, amphetamines), salbutamol in high doses, digoxin toxicity, and some antidepressants.

Call emergency services or present immediately to the nearest emergency department for any of the following high-risk features accompanying palpitations. Palpitations with syncope — loss of consciousness — or presyncope (near-faint with blackout or loss of postural tone) suggests a haemodynamically compromising arrhythmia such as ventricular tachycardia, complete heart block, or vasovagal syncope in the context of arrhythmia. Palpitations with chest pain, particularly the crushing pressure quality of ischaemic pain, suggests possible arrhythmia in the context of acute coronary syndrome — both require simultaneous emergency treatment. Palpitations with severe breathlessness at rest or rapidly progressive shortness of breath with oxygen desaturation suggests a haemodynamically significant arrhythmia causing acute heart failure. Palpitations in a person with known structural heart disease — hypertrophic cardiomyopathy, dilated cardiomyopathy, ischaemic heart disease, congenital heart disease, or significant valvular disease — carry substantially higher risk of life-threatening arrhythmia and require urgent evaluation regardless of haemodynamic stability. Palpitations in a person with a family history of unexplained sudden cardiac death under the age of 40, long QT syndrome, Brugada syndrome, or ARVC raise suspicion for inherited channelopathy and require specialist cardiological evaluation. A very rapid regular heartbeat sustained at 150–300 bpm without spontaneous termination over 30 minutes — particularly with any haemodynamic compromise — should be assessed urgently. Palpitations occurring in the context of an implanted pacemaker or ICD (implantable cardioverter defibrillator) delivery of a shock requires immediate cardiology assessment.

Detailed history establishes the symptom quality (skipping, racing, fluttering, pounding), onset (gradual versus abrupt), offset (gradual versus abrupt — SVT characteristically terminates abruptly), duration of each episode, frequency, precipitating factors (caffeine, alcohol, exertion, lying on the left side — which increases awareness of the heartbeat), associated symptoms (breathlessness, chest pain, presyncope, syncope), and a thorough review of medications including supplements and recreational drug use. A personal history of structural heart disease, prior arrhythmias, or cardiac surgery, and a family history of sudden cardiac death in a first-degree relative under 40, are critical risk-stratification factors. A 12-lead ECG at rest is the first investigation and is essential for all palpitation presentations — it identifies pre-existing arrhythmias (AF, VT), QT interval prolongation (inherited long QT syndrome or drug-induced), Wolff-Parkinson-White pattern (delta wave indicating an accessory pathway), Brugada pattern, and prior myocardial infarction (Q waves indicating scarring). A Holter monitor — a continuous ECG worn for 24, 48, or 72 hours — is the standard investigation when the resting ECG is normal and symptoms are frequent enough to likely occur during the recording period. An event recorder or loop recorder is used for less frequent episodic palpitations — the patient activates recording when symptoms occur, allowing symptom-rhythm correlation over weeks to months. An implantable loop recorder (ILR) is placed subcutaneously for palpitations causing significant concern or associated with syncope that remain undiagnosed after multiple non-invasive tests. Comprehensive blood tests include thyroid function (TSH and free T4 — hyperthyroidism causes sinus tachycardia and increases ectopic beat frequency); full blood count (anaemia); serum potassium, magnesium, and calcium (electrolyte abnormalities precipitate arrhythmias); and fasting glucose. Echocardiogram is recommended for palpitations with any clinical suspicion of structural heart disease, when the ECG shows LVH, when the patient has a family history of cardiomyopathy, or in those with high-risk features.

Benign ectopic beats (PACs and PVCs) in a structurally normal heart require reassurance and lifestyle modification as the cornerstone of management: eliminate or substantially reduce caffeine intake (coffee, tea, cola, energy drinks); abstain from or minimise alcohol; stop smoking; manage anxiety and stress through cognitive behavioural therapy, mindfulness, and exercise; ensure adequate sleep; and treat anaemia and thyroid disease if identified. Beta-blockers (bisoprolol, atenolol) at low doses reduce the frequency and perceptibility of ectopic beats in symptomatic individuals where lifestyle measures have been insufficient — they are effective and safe for long-term use. Atrial fibrillation management involves three concurrent strategic priorities: rate control (using beta-blockers, rate-limiting calcium channel blockers such as diltiazem or verapamil, or digoxin to keep resting heart rate below 80 bpm and exercise rate below 110 bpm); rhythm control (using cardioversion — electrical or pharmacological with flecainide, propafenone, amiodarone — to restore and maintain sinus rhythm, or catheter ablation of the pulmonary vein triggers for persistent or paroxysmal AF); and anticoagulation for stroke prevention (using direct oral anticoagulants — apixaban, rivaroxaban, edoxaban, or dabigatran — based on CHA2DS2-VASc stroke risk score). SVT is managed acutely with vagal manoeuvres — Valsalva manoeuvre with modified positioning (semi-recumbent to supine leg raise after straining), carotid sinus massage, or immersion of the face in cold water — which terminate SVT by increasing vagal tone and blocking the AV node; intravenous adenosine (6mg then 12mg) terminates SVT acutely in hospital. Long-term SVT prevention uses verapamil, beta-blockers, or radiofrequency catheter ablation (curative in approximately 95% of AVNRT cases). Ventricular tachycardia in the context of structural heart disease requires specialist electrophysiology management including antiarrhythmic drugs (amiodarone, sotalol), ICD implantation for secondary prevention of sudden cardiac death, and potentially VT ablation. Electrolyte supplementation corrects hypokalaemia and hypomagnesaemia-related arrhythmias.

Modifying lifestyle triggers is the most effective and immediate intervention for reducing benign palpitation frequency. Caffeine is the single most commonly identified palpitation trigger — reduce or eliminate coffee, tea, energy drinks, and cola; most people who eliminate caffeine notice reduction in palpitation frequency within 1–2 weeks. Limit alcohol strictly — alcohol is a direct cardiac arrhythmia trigger, causing AF (holiday heart syndrome) and increasing ectopic beat frequency even at moderate doses; complete abstinence may be necessary for those with AF or frequent SVT episodes. Stop smoking, as nicotine has direct chronotropic and pro-arrhythmic effects on the heart. Manage anxiety and panic disorder proactively — anxiety is one of the most important contributors to palpitation perception and frequency, and effective treatment with CBT and where appropriate selective serotonin reuptake inhibitors reliably reduces palpitation episodes. Maintain adequate hydration and electrolyte balance through a varied diet and appropriate fluid intake, as dehydration and electrolyte depletion (particularly low potassium and magnesium) lower the arrhythmia threshold. Ensure regular aerobic exercise — paradoxically, regular moderate exercise improves cardiac autonomic tone and reduces resting heart rate and ectopic beat frequency, while excessive high-intensity training (particularly in older endurance athletes) can increase AF risk. Detect and treat thyroid disease, anaemia, and electrolyte disorders through annual blood tests when risk factors are present. Reduce stimulant medication burden by reviewing all prescription and over-the-counter medications with your pharmacist or doctor. In those with known AF, consistent adherence to anticoagulation and rate-control or rhythm-control medications is essential to prevent stroke and cardiac deterioration.

Call emergency services immediately for palpitations with syncope (loss of consciousness or collapse), palpitations with severe chest pain, palpitations with marked breathlessness and oxygen desaturation, or a very rapid regular heartbeat sustained for more than 30 minutes without spontaneous termination — these are potential arrhythmic emergencies. Seek same-day emergency assessment for palpitations in a person with known structural heart disease (cardiomyopathy, valvular disease, prior myocardial infarction), palpitations with a family history of sudden cardiac death under 40, palpitations in a person with a pacemaker or ICD (particularly after an ICD shock), or palpitations in pregnancy (particularly if new onset in the third trimester). Schedule an urgent GP appointment within days for a first episode of prolonged palpitations lasting more than 5–10 minutes, palpitations associated with dizziness or presyncope without loss of consciousness, palpitations with known or suspected thyroid disease, or palpitations in a person with known hypertension, diabetes, or significant cardiovascular risk factors. Book a routine GP appointment for palpitations that are clearly brief (seconds), clearly triggered by caffeine or stress, improving with lifestyle modification, not associated with any haemodynamic symptoms, and not accompanied by syncope or chest pain. All patients with palpitations, regardless of suspected cause, should have at minimum a resting 12-lead ECG performed to screen for structural or electrical heart disease. A cardiac event recorder or Holter monitor is the appropriate next investigation when the resting ECG is normal but symptoms are recurrent.