Hyperthyroidism is short for hyperthyroidism. Hyperthyroidism may have cardiac effects such as increased heart rate, heart enlargement, heart failure, arrhythmia, and atrial fibrillation. The clinical manifestations of hyperthyroidism are mainly caused by the excess of circulating thyroid hormones and a series of hypermetabolic manifestations. In addition to the cardiovascular system manifestations, there may also be agitation, irritability and insomnia, fatigue, fear of heat, excessive sweating, emaciation, hyperphagia, increased frequency of bowel movements or diarrhea, and scanty menstruation in women. If the above symptoms occur and hyperthyroidism is suspected, the patient should consult a doctor in time and follow the doctor’s instructions for treatment through antithyroid medication, iodine 131, surgery and so on.