It is recommended to isolate one week after iodine-131 treatment, sleep in a separate room for two weeks after treatment, and not to contact vulnerable groups such as pregnant women, infants and children for one month after treatment. Iodine-131 treatment is an oral isotope of iodine, which is ingested into the thyroid tissue through the highly selective uptake function of iodine by the human thyroid tissue, and then destroys the follicular tissues of the thyroid gland through the β-rays emitted by its decay, so as to achieve the effect of treating hyperthyroidism. The vast majority of patients treated with iodine-131 are recommended to be isolated for one week after iodine-131 treatment and to sleep in a separate room for two weeks after treatment. Contact with different people after iodine-131 treatment requires different isolation times. Contact with babies, pregnant women, and the elderly requires extended isolation times, recommended to be around one month. Patients for iodine-131 treatment need to be guided by a doctor, it is recommended that patients go to a regular hospital in time.