Hyperthyroidism, or hyperthyroidism for short, is a thyrotoxicosis caused by excessive production of thyroid hormones by the thyroid glands themselves, and its causes include diffuse toxic goiter (Graves’ disease), nodular toxic goiter, and autonomic hyperfunctioning adenoma of the thyroid gland. The severity of hyperthyroidism signs and symptoms is related to factors such as the length of medical history, the degree of hormone elevation and the age of the patient. The main symptoms include hyperphagia, weight loss, fear of heat, excessive sweating, palpitations, agitation, irritability, insomnia, fatigue, increased stool frequency or diarrhea, protruding eyes, enlarged thyroid gland, and scanty menstruation in women. There are also some special types of hyperthyroid manifestations, including: thyroid crisis, thyrotoxic heart disease, hyperthyroidism in pregnancy, and apathetic hyperthyroidism. Thyroid crisis: Also known as hyperthyroid crisis, it is a syndrome of acute exacerbation of thyrotoxicosis, mostly occurring in patients with untreated or inadequately treated more severe hyperthyroidism. Clinical manifestations include high or excessive fever, profuse sweating, tachycardia, irritability, anxiety, delirium, nausea, vomiting, diarrhea, and in severe cases, heart failure, shock and coma. Thyrotoxic heart disease: The effect of thyrotoxicosis on the heart leads to tachycardia, arrhythmia, atrial fibrillation and heart failure. Hyperthyroidism in pregnancy: hyperthyroidism in pregnancy is special and can be harmful to both the pregnant woman and the fetus, so if the patient’s hyperthyroidism is not controlled, it is recommended not to get pregnant; if the patient is receiving anti-thyroid medication and the serum TT? and TT? reach the normal range, stop anti-thyroid medication or apply the minimum dose of anti-thyroid medication, pregnancy is possible; if the patient is hyperthyroidism found during pregnancy, the If the patient chooses to continue pregnancy, then in principle, treatment with antithyroid drugs is the mainstay, or surgical treatment in the middle of pregnancy. Apathetic hyperthyroidism: It is usually seen in elderly patients with insidious onset and atypical hypermetabolic symptoms, mainly manifested as weakness, palpitations, anorexia, depression, drowsiness, and significant weight loss. In summary, hyperthyroidism is a disease caused by excessive thyroid hormones. Its clinical manifestations are diverse, either mild or severe, obvious or insidious, so if patients show the above symptoms, they must pay attention to them and go to the hospital for testing in time to avoid delaying the disease.