Iodine 131 is a radioactive element, so the toilet is recommended to be used separately after Iodine 131 treatment, especially avoiding sharing with pregnant women and children. Iodine 131 is a nuclide that is mainly used to treat diseases such as hyperthyroidism and thyroid cancer. After outpatient iodine 131 treatment, it is also recommended to separate from the surrounding people for a period of time, the toilet is best used separately, and try to avoid contact with pregnant women and children. If you are hospitalized iodine 131 for thyroid cancer treatment, you need to separate from the people around you, usually for about 3-5 days, and the toilets should also be separated, and if the dose is larger you need to extend the time appropriately. After Iodine 131, take rest to prevent infection. Specific precautions should be consulted with your doctor.