First of all, it is important to know why “iodine drops” (iodine 131) can treat “hyperthyroidism”. “Hyperthyroidism is the abbreviation for hyperthyroidism. The normal human thyroid gland has the function of secreting (“producing”) thyroid hormones, which regulate the metabolism of various substances in the human body, maintain the excitability of the human nervous system, etc., as well as the needs of infants and children’s growth and development. The production of thyroid hormone is essential, and the main raw material is iodine, and most of the iodine in the human body is absorbed by the thyroid gland. Iodine 131 is a radioactive substance that is involved in the synthesis of thyroid hormones in the same way as iodine in our food. Thus when the thyroid gland absorbs iodine 131, the radioactivity produced by iodine 131 kills the thyroid cells and reduces the number of thyroid cells, thus treating hyperthyroidism. In the treatment, because the main absorption and metabolism site is the thyroid gland, not absorbed iodine 131 finally eliminated from the body through the urine and feces, so that for the gonads and so on only a transient effect, so, iodine 131 treatment will not have adverse effects on the reproductive organs, on the contrary, hyperthyroidism is not healed for a long time, the drug treatment for reproductive functions, such as sperm vitality, the ability of oocytes to implant as well as the embryo’s development caused by the effect of the eventual This can lead to infertility and problems with the development of the fetus. Due to the regenerative ability of sperm and egg cells, it is generally recommended to prepare for pregnancy 3-6 months after iodine treatment. It is also generally not recommended to become pregnant after surgery for hyperthyroidism or during treatment with antithyroid medication.