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A palpitation is an awareness of the beating of the heart, whether it is too slow, too fast, irregular, or at its normal frequency; brought on by overexertion, adrenaline, alcohol, disease (such as hyperthyroidism) or drugs, or as a symptom of panic disorder. More colloquially, it can also refer to a shaking motion. Nearly everyone experiences a very occasional awareness of their own heart beating but, when it occurs frequently, it can indicate a problem. Palpitations may be felt with heart problems, but also in anemias and thyroid malfunction. Attacks can last for a few seconds or hours, and may occur very infrequently, or more than daily. Palpitations alongside other symptoms, including sweating, faintness, chest pain or dizziness, indicate irregular or poor heart function and should be looked into. Palpitations may also be associated with anxiety and panic attacks, in which case psychological assessment is recommended.
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