Hyperthyroidism is a series of symptoms caused by excessive thyroid hormones, hypermetabolism and sympathetic excitation. It is potentially life-threatening if the condition progresses rapidly over a short period of time, or is difficult to control over a long period of time, or if the patient’s underlying condition is poor, inducing a thyroid crisis or serious damage to the organs. Hyperthyroidism is caused by the thyroid gland synthesizing and releasing too much thyroid hormone, which can be seen in diffuse toxic goiter, thyroid autonomous high-functioning adenoma, Hashimoto’s thyroiditis and so on. Clinical manifestations mainly include goiter, protruding eyes, trembling hands, irritability, irritability, insomnia, palpitations, hyperphagia, fatigue, emaciation, fear of heat, excessive sweating, diarrhea and so on. If hyperthyroidism progresses rapidly, the treatment is not timely or unreasonable, the condition is difficult to control for a long time, or the patient’s basic condition is poor, it can induce thyroid crisis or serious target organ damage, such as cardiac failure, hepatic failure, respiratory failure, etc., which may be life-threatening. Patients with hyperthyroidism should seek timely medical treatment and standardize the treatment under the guidance of doctors.