Hyperthyroidism itself is prone to recurrence, and the treatment after recurrence is the same as that of primary hyperthyroidism: 1. In terms of lifestyle, choose a low iodine diet or a diet that prohibits iodine, prohibit eating seafood, and pay attention to rest; 2. Medication, there are two commonly used medications at present, namely, methimazole and propylthiouracil. At the beginning of the treatment stage, the drug dose should be large, and after the hyperthyroidism is under control, the dose will be gradually reduced, and the dose will be reduced once in 2-3 weeks, and then the dose will be reduced to the maintenance dose, and the maintenance dose will be maintained for about one and a half years. The whole course of hyperthyroidism treatment is about 2 years. If the patient has a recurrence during the course of treatment, start again from the beginning. If the patient can not control hyperthyroidism after 4 years of repeated drug treatment, it is recommended to choose radical treatment; 3. Radical treatment includes isotope therapy, i.e. oral iodine-131 and surgical treatment, and most of the patients choose isotope therapy nowadays. Iodine-131 emits a kind of beta ray with a short range. After taking the medicine, due to the hyperthyroid state, iodine-131 will coalesce in the thyroid tissues, destroying the thyroid tissues, removing part of the thyroid tissues, and restoring the thyroid function to normal.