131 iodine, also known as iodine drops, is the first choice of treatment for adult hyperthyroidism. Compared with traditional medical and surgical treatments, it is simple, safe, inexpensive, fast, has a high cure rate, low recurrence rate, few side effects, no hospitalization, and no incisions. This method selectively gathers 131 iodine in the thyroid gland and sends out a very short ray to destroy the thyroid gland in a controlled and targeted manner, thus achieving the goal of curing hyperthyroidism, with the effect of “drug surgery”. In developed countries such as Europe and America, about 70-90% of hyperthyroid patients choose this method.