Iodine-131 treatment can be performed as an inpatient or as an outpatient. Iodine-131 treatment is the oral administration of isotope iodine, which is ingested into the thyroid tissue through the highly selective iodine uptake function of the body’s thyroid tissue, and destroys the follicular tissues of the thyroid gland through the beta rays emitted by its decay, so as to achieve the effect of treating hyperthyroidism. Iodine-131 treatment is mainly suitable for patients who cannot be operated or have recurrence after surgery, drug allergy or poor efficacy. It should be noted that in view of the radioactivity of iodine-131 treatment, home isolation is required after treatment, living in a single room and sharing meals, using a separate bathroom to avoid contamination of body fluids. Diet to maintain a low iodine diet, do not rub the thyroid gland pressure, need to regularly review the blood routine, thyroid function, liver function, kidney function. Whether iodine-131 treatment requires hospitalization, please under the guidance of doctors in regular hospitals, do not decide on your own to avoid adverse consequences.