After iodine 131 is administered to the thyroid, avoid close and prolonged contact with others (within 1 meter for more than 3 hours) for 1 week. Avoid close contact with infants, young children and pregnant women for 2 weeks after treatment, and avoid sharing utensils with others. Consult your doctor for specific advice. The principle of iodine 131 treatment is that iodine 131 releases beta rays in the process of decay, and beta rays have strong ionizing radiation ability, which causes part of the thyroid follicular cells to degenerate and necrotic, and reduces the synthesis and secretion of thyroid hormones, and then reduces the size of the thyroid gland, so that the treatment of hyperthyroidism can be achieved. Taking appropriate measures to provide necessary and appropriate isolation for patients discharged from Iodine 131 treatment is an essential part of the treatment process. After iodine 131 treatment, it is recommended to follow the doctor’s instructions for isolation and living. It is recommended to consult the endocrinology department of regular hospitals if there is any discomfort, and not to be negligent so as not to delay or aggravate the condition.