Heart palpitations that won't stop: what to know

Ongoing pounding, racing, fluttering, or skipped beats may come from stimulants, stress, fever, dehydration, medicines, or an abnormal rhythm. A persistent episode cannot be judged by sensation alone. Sit down, avoid exertion, and assess whether the beat feels regular and whether other symptoms are developing.

Atrial fibrillation is one possible rhythm problem. Anaemia, iron deficiency anaemia, hyperthyroidism, and dehydration can also leave the heart working harder. Heart failure can cause palpitations alongside breathlessness, swelling, or unusual fatigue. These conditions are possibilities rather than conclusions; an electrocardiogram during symptoms can be particularly useful.

Stop activity and sit or lie down somewhere safe. Breathe slowly and ask someone to stay with you if you feel unwell. Avoid caffeine, nicotine, alcohol, and decongestants. Do not take a borrowed medicine or try to force the heartbeat to change. Note when it began, your pulse if measurable, regularity, medicines, and associated symptoms while arranging medical advice.

Call emergency services now for chest pain, severe breathlessness, fainting, new confusion, blue lips, or severe weakness. Seek urgent assessment for palpitations that persist despite rest, feel markedly irregular, or occur with dizziness. Do not drive yourself if you may faint.

Ask whether you need an electrocardiogram, blood tests, or a wearable monitor. Bring a list of medicines and supplements, and describe recent illness, fluid loss, thyroid symptoms, anaemia symptoms, and stimulant use.