Heart Palpitations
Sensation of rapid, fluttering, or pounding heartbeat
TL;DR
Awareness of your own heartbeat — racing, pounding, fluttering or skipping. Usually benign ectopics amplified by caffeine, stress or alcohol, but palpitations with faintness, chest pain or a family history of sudden death need investigation.
Overview
Palpitations are the awareness of the heartbeat, which people describe as racing, pounding, fluttering, or skipped and thudding beats. The vast majority are benign. The commonest finding is ectopic beats — extra beats from the atria or ventricles that everyone has but some people feel, producing the characteristic skipped-beat-then-thud pattern as the post-ectopic beat ejects a fuller ventricle. Ectopics are amplified by caffeine, alcohol, nicotine, stress, sleep deprivation and adrenaline. True arrhythmias sit behind a minority: supraventricular tachycardia produces sudden-onset, sudden-offset racing at 150-250 beats per minute; atrial fibrillation produces an irregularly irregular racing, most significantly in older people because of its stroke risk. Non-cardiac causes are common and checkable: anaemia, overactive thyroid, fever, low blood sugar, pregnancy, and anxiety with its adrenaline surges — panic attacks and SVT can be hard to tell apart at the bedside, which is why capturing the rhythm during an episode is the single most valuable diagnostic step. Smartwatch ECGs and ambulatory monitors now make that capture routine.
Common Symptoms
- •Skipped beats followed by a thud — the ectopic signature
- •Sudden-onset, sudden-offset rapid regular racing, typical of SVT
- •Irregularly irregular racing, typical of atrial fibrillation
- •Pounding or forceful heartbeat with exertion, fever or stress
- •Fluttering in the chest or throat
- •Racing with tremor, breathlessness and fear — panic pattern
- •Associated dizziness, chest pain or blackout — red flags
Common Causes
- •Ectopic beats amplified by caffeine, alcohol, nicotine and stress
- •Anxiety and panic attacks with adrenaline surges
- •Supraventricular tachycardia from re-entrant circuits
- •Atrial fibrillation and flutter
- •Anaemia
- •Hyperthyroidism
- •Fever, dehydration and low blood sugar
- •Pregnancy
- •Medications and substances: decongestants, asthma inhalers, stimulants, cocaine and amphetamines
- •Electrolyte disturbance, particularly low potassium and magnesium
- •Structural heart disease in a minority
Root Causes
Ectopic beats arise from irritable foci in the atria or ventricles, provoked by stimulants, stress hormones, electrolyte disturbance and sleep deprivation, and are felt because the compensatory pause and forceful post-ectopic beat create the skip-and-thud sensation. Re-entrant circuits in or around the AV node produce SVT. Disorganised atrial activity produces fibrillation. Hyperthyroidism and anaemia raise cardiac output and heart rate, making normal rhythm feel forceful.
How It's Diagnosed
Diagnostic Markers
- Capturing the rhythm during an episode — smartwatch ECG, ambulatory monitor or event recorder
- 12-lead ECG for baseline conduction and clues
- Thyroid function tests
- Full blood count for anaemia
- Electrolytes including potassium and magnesium
- Echocardiogram where structural disease is suspected or the ECG is abnormal
- Exercise testing where episodes are exertional
- Alcohol and caffeine intake history
When to See a Doctor
Seek emergency care for palpitations with fainting, near-fainting, chest pain, severe breathlessness, or a family history of sudden death at a young age. Book a prompt review for recurrent sustained racing, an irregular rhythm (possible atrial fibrillation, which carries stroke risk), or episodes that are worsening. Bring a smartwatch recording if you have one — rhythm captured during an episode shortens the diagnostic path enormously.
Supplements Studied For This
Diet & Lifestyle
Suggested Pattern
The dietary triggers are specific and modifiable. Caffeine is the classic provoker, though trials show habitual coffee drinkers tolerate it better than often assumed; energy drinks combine high-dose caffeine with other stimulants and are a more consistent trigger. Alcohol provokes arrhythmias directly — holiday heart syndrome describes atrial fibrillation after binge drinking — and even moderate regular drinking raises AF risk measurably. Decongestants containing pseudoephedrine and stimulant-containing supplements are overlooked triggers. Low potassium and magnesium from poor intake or diuretics increase irritability.
Eat more
- Potassium-rich foods: bananas, potatoes, beans and leafy greens
- Magnesium-rich foods: nuts, seeds, whole grains and dark chocolate in moderation
- Adequate regular meals to avoid low blood sugar
- Plenty of fluids, since dehydration provokes ectopics
Avoid
- Energy drinks — high-dose caffeine plus stimulants
- Excess caffeine, particularly if not habituated
- Binge alcohol and regular heavy drinking
- Decongestants with pseudoephedrine and stimulant pre-workout supplements
- Nicotine
Supporting Research
Effect of Magnesium on Ventricular Extrasystoles in Children
Prophylactic magnesium does not prevent atrial fibrillation after cardiac surgery: a meta-analysis
Preventing Postoperative Atrial Fibrillation After Noncardiac Surgery: A Meta-analysis
Effect of Long-Term Marine Omega-3 Fatty Acids Supplementation on the Risk of Atrial Fibrillation in Randomized Controlled Trials of Cardiovascular Outcomes: A Systematic Review and Meta-Analysis
Efficacy and Safety of Omega-3 Fatty Acids in the Prevention of Cardiovascular Disease: A Systematic Review and Meta-analysis
Frequently Asked Questions
Who It Affects
Palpitations account for around 15% of GP consultations; most prove benign, with atrial fibrillation found in a small but important minority.
Benign ectopics occur in everyone and are simply felt more by some, particularly at rest and at night. SVT typically begins in young adulthood with a female skew. Atrial fibrillation rises steeply with age, hypertension and alcohol. Thyroid-driven palpitations cluster in women, and pregnancy produces benign forceful beating through increased blood volume.
Lifestyle Tips
- •Record episodes with a smartwatch ECG if you have one — a captured rhythm is the fastest route to a diagnosis
- •Note triggers: caffeine, alcohol, stress, poor sleep and dehydration are the usual amplifiers
- •Cut caffeine and alcohol for two weeks as a diagnostic trial
- •Vagal manoeuvres — bearing down as if straining, or cold water on the face — can terminate SVT; learn them from your clinician
- •Treat anxiety actively; panic and arrhythmia mimic each other and treating the wrong one fails
- •Prioritise sleep, since deprivation measurably increases ectopic frequency
- •Never use stimulant supplements or illicit stimulants with a history of palpitations
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This information is for educational purposes only. Always consult a healthcare professional before starting any supplement regimen.