To some extent, there is no sign of hyperthyroidism. The most direct symptom is abnormal swelling of eyes, neck, limbs or other parts of the body. But this is only the potential manifestation of hyperthyroidism, and the harm of hyperthyroidism goes far beyond this. To say the harm of hyperthyroidism can be understood from its specific symptoms: First, patients with hyperthyroidism will have goiter, exophthalmos, hyperthyroidism heart disease and hyperthyroidism crisis. Secondly, the damage of hyperthyroidism to the digestive system of patients: hyperthyroidism can lead to complications such as liver function damage, hepatocyte necrosis and degeneration, elevated transaminase, hepatomegaly, cholestatic jaundice, gastrointestinal dysfunction, extreme emaciation and so on; Thirdly, the damage of hyperthyroidism to hematopoietic system: hyperthyroidism can lead to leukopenia, anemia and thrombocytopenia; Finally, the harm of hyperthyroidism to reproductive system: hyperthyroidism can lead to decreased sexual desire, impotence, decreased sperm count, infertility and breast development in men. Hyperthyroidism can cause menstrual disorder, amenorrhea, infertility, and even fetal dysplasia, premature delivery, abortion, fetal dysplasia and stillbirth after pregnancy; Generally speaking, the harm of hyperthyroidism is absolutely wholehearted, and basically all systems of the human body will be affected. Therefore, it is very important to pay attention to hyperthyroidism and take preventive measures.