Are heart palpitations dangerous?

Palpitations are sensations of pounding, fluttering, racing, or skipped beats. They can occur after stress, poor sleep, caffeine, fever, or exertion. A palpitation does not by itself identify a heart problem. Possible contributors include dehydration, low blood sugar, anaemia, an overactive thyroid, anxiety, or an abnormal rhythm such as atrial fibrillation. Heart failure can also cause breathlessness, swelling, and a fast heartbeat, so the overall pattern matters.

Stop strenuous activity, sit upright, and breathe slowly. Note when it began, whether the beat feels regular or uneven, how long it lasts, and what you were doing beforehand. Avoid caffeine, nicotine, and stimulant medicines until you have advice. Arrange a clinical review if episodes recur, last longer, or are becoming more noticeable; an examination and an ECG may help identify the rhythm.

Seek emergency help now for palpitations with chest pressure, fainting, severe difficulty breathing, new confusion, or marked weakness. Seek same-day medical advice for a persistent racing or irregular heartbeat, especially if you have known heart disease or symptoms such as ankle swelling. Do not drive yourself if you feel faint.

Ask whether your symptoms could relate to your medicines, thyroid function, blood count, hydration, or heart rhythm. Tell the clinician about family history, recent illness, and any home pulse readings.