Iodine is the raw material for synthesizing thyroid hormone. The iodine in the food we usually eat is a stable nuclide, and iodine 13 1 is a radioactive nuclide. The difference between them lies in their physical properties. Iodine 13 1 can emit a β ray, but iodine in the experiment can't emit a ray. Their chemical properties are exactly the same. It can participate in the synthesis of thyroid hormone and be absorbed by thyroid tissue. The principle of iodine 13 1 therapy is to use this acupoint to be absorbed by thyroid tissue, and at the same time emit rays to act on thyroid cells, so that the cells are damaged by irradiation and the synthesis of thyroid hormones is reduced, thus achieving the purpose of controlling hyperthyroidism. /program/jkzlzmb/2003 08 22/ 10 1073。 Shtml hyperthyroidism (referred to as hyperthyroidism) refers to the clinical syndrome caused by the enhancement of thyroid function and excessive secretion of thyroid hormone due to various reasons. There are three ways to treat hyperthyroidism: taking antithyroid drugs, operation and using 13 1 iodine. Antithyroid drugs work by interfering with the synthesis of thyroxine. This method is effective and relatively safe, but the course of treatment is generally long, at least 1 ~ 2 years. Long-term drug use can cause adverse reactions such as granulocytopenia, and the recurrence rate after drug withdrawal is high, reaching more than 40%. Thyroid surgery has high curative effect and low recurrence rate, but it has certain risks and contraindications, and may cause complications and scars. Radionuclide iodine 13 1 is a mature and good method to treat hyperthyroidism, which is simple, safe and effective. Radionuclide iodine 13 1 has been used to treat hyperthyroidism for more than half a century. More than one million cases have been treated worldwide, and the curative effect is remarkable. At present, people pay more and more attention to it. The United States has taken this method as the first choice for the treatment of hyperthyroidism. The principle of radionuclide iodine 13 1 in the treatment of hyperthyroidism is that the normal thyroid gland has a strong ability to absorb iodine, and it is stronger in hyperthyroidism. However, the nuclide iodine 13 1 can release β -rays in the thyroid gland (the range of this ray in the tissue is only 2 mm, and the radiation is limited to the thyroid gland and does not involve adjacent tissues), which will destroy the epithelial cells of thyroid acinus and reduce the production of thyroxine. According to a large number of clinical data, the radionuclide iodine 13 1 has excellent curative effect and low recurrence rate, and more than 80% patients can be cured at one time. The treatment is extremely simple, and patients only need to take a small amount of medicine like drinking water. Its safety is beyond doubt. Under the conventional dose, the radiation dose received by patients is not as good as that of ordinary X-rays. Therefore, people don't have to worry about its radioactive damage to human body. In addition, the cost of radionuclide therapy is low, which can save medical expenses for patients. Of course, the radionuclide iodine 13 1 also has some side effects in the treatment of hyperthyroidism. Very few patients will have hypothyroidism after treatment, but its incidence is not higher than that of antithyroid drugs or surgery, and hypothyroidism is easier to control than hyperthyroidism. As long as appropriate thyroxine is supplemented, hormones can be maintained at a normal level, and work, study and life will not be affected. In addition, growing teenagers, pregnant women, patients with nodular hyperthyroidism and patients with a history of myocardial infarction are generally not suitable for treatment with radionuclide iodine 13 1. It can be seen that the three treatment methods of hyperthyroidism have their own advantages and disadvantages. Only through doctors' comprehensive understanding and comprehensive weighing of patients' specific conditions can we choose the most suitable treatment scheme for patients.