When people's heart is uncomfortable, their first reaction is to suspect that they have a heart disease. Wu Cailan, director of the nuclear medicine department of the fourth central hospital, reminded that sometimes heart discomfort may be caused by hyperthyroidism. The effect of hyperthyroidism on the cardiovascular system is characterized by high dynamic circulation. Most patients have persistent palpitations, feel strong heartbeat, short breath in severe cases, unable to lie flat, heart failure and arrhythmia. Arrhythmias are mainly sinus tachycardia and atrial premature beats, accompanied by hypermetabolic syndrome caused by hyperthyroidism and the involvement of various systems. Hyperthyroid heart disease is a special clinical manifestation of hyperthyroidism, often with a long course of disease. Therefore, patients with hyperthyroidism can not delay the course of disease, and early treatment can prevent the occurrence of hyperthyroidism heart disease. (outlook new era)