The danger of hyperthyroidism is systemic, the circulatory system, digestive system, muscle and nervous system will be affected. 1. Circulatory system: the increased secretion of thyroid hormones in hyperthyroidism patients can act on the catecholamine receptors on the heart and enhance the positive inotropic effect of the myocardium, which can cause tachycardia, increased cardiac output, atrial fibrillation and heart failure and other hazards. 2. Digestive system: patients with hyperthyroidism can have digestive system manifestations such as hyperphagia, increased stool frequency and diarrhea. 3. Muscle and nervous system: Hyperthyroidism can cause symptoms such as agitation, irritability and insomnia, excessive sweating and fatigue, and can also be accompanied by periodic paralysis, causing muscle weakness and atrophy. In addition, hyperthyroidism can also cause weight loss, menstrual disorders, protruding eyes and other hazards, therefore, patients with hyperthyroidism should go to the hospital in a timely manner, under the guidance of the doctor for early treatment and early improvement of symptoms.