Hyperthyroidism is the abbreviation of hyperthyroidism. Hyperthyroid patients with at least one of the following cardiac abnormalities can be diagnosed with hyperthyroid heart disease: (1) enlargement of the heart; (2) arrhythmia; (3) congestive heart failure; (4) angina pectoris or myocardial infarction. When diagnosing, it is necessary to exclude the simultaneous existence of other causes of cardiac changes, and the above cardiac conditions improve or significantly improve after hyperthyroidism is controlled. Excessive thyroid hormone can lead to tachycardia, increased cardiac contractile function, increased blood excretion, resulting in increased cardiac load, increased myocardial oxygen consumption, and relative insufficiency of coronary artery blood supply, which can lead to abnormal cardiac changes, and is likely to occur in patients with underlying ischemic heart disease. Patients with hyperthyroid heart disease are recommended to be diagnosed and treated under the guidance of specialized doctors.