Hyperthyroid patients need to maintain a distance of more than 1 meter from their family members for at least one week after iodine-131 treatment, and at the same time pay attention to the need for special populations such as pregnant women, infants and children who need to maintain a distance of more than 1 month. Treatment of hyperthyroidism with iodine-131 is usually below the nationally allowed standard in 24 hours. However, to be on the safe side, it is recommended to exceed the first half-life of iodine-131 before close contact. The half-life of iodine-131 is 8 days, and the number of radioactive atoms decreases by an average of 50% with each half-life, so it is recommended that family members not be exposed for more than 1 week. Meanwhile, it is recommended that patients who have taken Iodine-131 treatment should not use the same dishes in their daily life, and use and place towels, basins, personal clothing and other personal items separately. Flush the toilet several times after using it and disinfect it regularly. After more than one week of isolation, daily life can be carried out normally except for sex, but it is also necessary to keep a distance from special groups such as pregnant women, infants and children for a period of time. It is recommended to consult a professional doctor to clarify the precautions to be taken after taking Iodine-131 treatment.