Hyperthyroidism is a systemic disease. The main symptoms of hyperthyroidism are fear of heat, excessive sweating, excessive food and easy hunger, emaciation, panic and protruding eyes. Long-term untreated hyperthyroidism can affect multiple systems throughout the body and produce a variety of clinical symptoms, which can be life-threatening in serious cases, mainly including the following: 1. Long-term increase in the body’s metabolic rate and muscle catabolism, patients will experience extreme lethargy, muscle weakness and poor body resistance, which affects normal life. 2. Long-term untreated hyperthyroidism can lead to liver function damage, causing liver failure in serious cases. 3. Severe hyperthyroidism can also lead to leukopenia or even granulocyte deficiency, resulting in serious uncontrollable infections in the body. 4. Long-term hyperthyroidism can lead to accelerated heart rate, and in serious cases, hyperthyroid heart disease such as arrhythmia, heart enlargement and heart failure, and even sudden cardiac death. 5. Severe hyperthyroidism that is not treated for a long time may occur under the causative factors such as infection, surgery and childbirth, and thyroid Thyroid crisis is a serious complication of hyperthyroidism, with high mortality rate, and requires active treatment.