Iodine-131 treatment uses radioactive iodine elements and should normally be isolated from adults for about 2 weeks after treatment, avoiding contact with pregnant women and infants, and the isolation period should be 4 weeks or more. Iodine-131 is a radioactive element and patients need to be treated in isolation after treatment in order to avoid affecting others. Radioactive iodine releases rays during the decay process, and its physical half-life is 8.05 days, and the effective half-life is 7.6 days. Generally, it needs to go through 5 half-lives, i.e., it can be completely metabolized within 35-40 days after doing iodine-131 treatment. Patients with hyperthyroidism use a small amount of medication, and they should drink more water and urinate more within 2 days after using the medication, and they should keep a distance of more than 1.8m from others for 2 weeks after taking the medication. In addition, iodine-131 treatment for 1 month should try to avoid going to public places, avoid contact with pregnant women, infants and children. In addition, after iodine-131 treatment, patients should use daily necessities alone, pay attention to more rest, drink more water, avoid emotional stimulation, light diet, avoid touching the thyroid gland and so on.