Hyperthyroidism is clinically treated with isotope therapy most people get better within about 3 to 4 months, and iodine 131 is mainly used to treat hyperthyroidism. However, the treatment time can not be generalized, each person’s condition is different, the physical condition is different, the sensitivity of the treatment is different, the therapeutic effect varies from person to person. Hyperthyroidism in the clinical use of isotope therapy, mainly the use of radioactive iodine 131 treatment through the oral method. Iodine 131 releases β-rays in the process of decay, and β-rays have strong ionizing radiation ability, which makes part of the thyroid follicular cell degeneration and necrosis, and reduces the synthesis and secretion of thyroid hormones, and the volume of the thyroid gland shrinks, thus achieving the purpose of treating hyperthyroidism. Generally, the effect is obvious in about 1 month of treatment, and the thyroid function of more than 60% of the patients returns to normal in 3 to 4 months of treatment. For patients whose hyperthyroidism is not relieved after 3 to 6 months of iodine 131 treatment, another iodine 131 treatment may be recommended. Individuals with hyperthyroidism may progress to hypothyroidism, which requires supplemental levothyroxine sodium under the guidance of a doctor. For the treatment of patients with hyperthyroidism, it is recommended to consult the endocrinology department of regular hospitals.