Iodine 131 treatment does not kill lymph nodes, iodine 131 treatment is generally used in the clinical treatment of hyperthyroidism, patients with hyperthyroidism, the effect of conservative treatment of drugs is not good, in addition to surgical treatment can be taken in addition to iodine 131 radiation therapy. After taking the isotope iodine 131 orally, the thyroid gland can ingest iodine 131 and most of the iodine 131 will be absorbed by the thyroid gland. Iodine 131 can release β-rays and γ-rays in the body, thus killing the surrounding thyroid cells, and playing the same effect as surgical removal of the thyroid gland. Although the radiation has a certain degree of radioactivity, the vast majority of iodine 131 is absorbed by the thyroid gland, and the ray’s action distance is very short and will not produce too much damage to the surrounding tissues, and the general application of iodine 131 treatment is not able to kill the lymph node cells.