It is possible to live up to ten years after taking iodine 131. Iodine 131 is usually seen in patients with hyperthyroidism who need iodine radiation therapy, the role of iodine radiation therapy for hyperthyroidism is to destroy the thyroid tissue and reduce the production of thyroid hormones. This method is simple, economical and has a high cure rate. After the operation, there may be hypothyroidism, which requires lifelong treatment with levothyroxine, but as long as the medication is standardized under the guidance of a doctor to keep the thyroid hormones within a reasonable range, the prognosis is good and generally can live for ten years. However, radioactive thyroiditis and exacerbation of active Graves’ ophthalmopathy may occur after iodine radiation therapy. Patients who need to take iodine 131 treatment are advised to do so under the supervision of a doctor.