Hyperthyroidism patients taking methimazole, propylthiouracil and other antithyroid drugs, if the dose of the drug is too large may cause medication hypothyroidism, in this case can be discontinued under the guidance of the doctor’s treatment. Iodine 131 treatment and surgical treatment may also cause hyperthyroidism to become hypothyroidism, and it is recommended to consult your doctor. In the process of drug treatment of hyperthyroidism, because the drug inhibits the synthesis of thyroid hormone, overdose of drug or untimely reduction of drug may cause hypothyroidism, in this case, should consult a doctor in time and adjust the dosage of drug under the guidance of the doctor. Iodine 131 or surgical treatment destroys part of the thyroid tissue to treat hyperthyroidism. If hypothyroidism occurs, it indicates that the remaining thyroid tissue cannot produce enough thyroid hormone. Prompt medical treatment is needed. Hyperthyroidism to hypothyroidism should be treated under a doctor’s supervision, and the specific treatment varies from person to person.