Heart Palpitations: When to Worry and What to Do

What we checked to reach this conclusion

We reviewed published cardiology guidelines, large observational studies on palpitation outcomes, and the clinical protocols used by emergency physicians and general practitioners to triage palpitation complaints. Our standard was simple: what does the best available evidence say about which palpitations need urgent attention and which do not — regardless of whether that aligns with what's commonly told to patients.

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  Cardiology literature on palpitation aetiology reviewed Studies consistently show that the majority of palpitations presenting to primary care are benign, most commonly caused by ectopic beats (PACs and PVCs), anxiety, or lifestyle triggers rather than structural heart disease.
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  Red-flag symptom criteria cross-referenced The clinical red flags most reliably associated with serious arrhythmia — syncope, presyncope, chest pain, exertional onset, and palpitations in patients with known heart disease — are consistent across American Heart Association, European Society of Cardiology, and NICE guidelines.
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  Diagnostic pathway effectiveness assessed A resting ECG combined with a basic metabolic panel and thyroid function test identifies the majority of correctable causes; ambulatory monitoring (Holter or event recorder) captures arrhythmias missed at rest in patients with frequent or ongoing symptoms.
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  Common lifestyle triggers evaluated against evidence Caffeine, alcohol, nicotine, stimulant medications, sleep deprivation, and high stress are all robustly documented triggers; addressing these resolves palpitations in a significant proportion of otherwise healthy patients without any further intervention.

Different situations call for different responses — here's how to choose

What you should do depends almost entirely on what your palpitations feel like, when they happen, and whether anything else is going on at the same time.

What people try first that makes things worse — or wastes time

A few popular responses to palpitations are either unhelpful or actively delay you getting the right information.

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  Googling your symptoms for a self-diagnosis — Online symptom searches for palpitations reliably surface terrifying possibilities (ventricular fibrillation, heart attack, sudden cardiac death) that bear almost no statistical relationship to what's actually causing a typical healthy person's occasional flutters. You'll either catastrophise needlessly or, worse, find a forum that convinces you it's nothing when you actually need an ECG.
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  Relying solely on a consumer smartwatch for reassurance — Apple Watch, Fitbit, and similar devices can detect certain rhythms and have genuine value as a supplement to medical assessment, but they miss arrhythmias, produce false positives, and are not diagnostic tools. A clean reading on your watch does not rule out a clinically significant problem.
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  Ignoring palpitations that come with other symptoms — The majority of people who wait and see when they have benign palpitations are fine — but the minority with serious arrhythmias who delay evaluation risk stroke (in undiagnosed atrial fibrillation) or worse. The red-flag symptoms in this guide are your decision criteria; don't dismiss them.
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  Taking magnesium supplements without testing your levels first — Magnesium deficiency can genuinely cause palpitations, and supplementation helps — but only if you're actually deficient. Taking supplements without a blood test means you may spend months on magnesium while a thyroid problem or arrhythmia goes undetected. Get tested first.