For hyperthyroidism patients in general, reducing iodine intake is important for hyperthyroidism control. But for pregnant and lactating hyperthyroid patients, is it also necessary to strictly control the intake of iodine? For this question, many hyperthyroid patients and even medical workers have a misunderstanding, that gestational hyperthyroidism, lactation hyperthyroidism and general hyperthyroidism, need to strictly control the intake of iodine. Is this practice right or wrong? Women with hyperthyroidism in pregnancy and lactation in the end how to grasp the issue of iodine intake? First of all, it is clear that due to the increased production of thyroid hormones during pregnancy, increased urinary iodine excretion, and fetal iodine requirements, the iodine needs of pregnant women increase compared to non-pregnant women. In addition, the iodine requirement of the baby is mainly taken up through breast milk, so the maternal iodine requirement is also increased. Therefore, both hyperthyroidism and hypothyroidism patients need to take iodine supplements during pregnancy and breastfeeding. Since iodine is crucial to the development of the fetus and the child, insufficient iodine intake will definitely affect the growth and development of the fetus and the child. Secondly, how much iodine supplementation is appropriate? It is now believed that pregnant and lactating women should consume at least 250ug of iodine per day. For iodine-deficient areas, in order to ensure a daily intake of 250ug of iodine, oral iodine-containing dietary supplements containing 150ug of iodine can be given to women who are planning to become pregnant, or who are already pregnant or breastfeeding. For areas without iodine deficiency, to ensure adequate iodine intake, appropriate adjustments can be made according to the local dietary structure and salt iodization. Of course, excessive iodine intake may have the potential risk of causing fetal hypothyroidism, so pregnant women should not consume more than 500ug of iodine per day from diet and iodine-containing dietary supplements. Some patients may wonder, “I already have hyperthyroidism, isn’t there already a lot of iodine in my body? Why do I still need iodine supplementation? In fact, even for a more serious hyperthyroidism patients, her body excessive iodine mainly in the thyroid hormone, the metabolism of free iodine is only about 50ug, which from the pregnant women and maternal needs of 250ug iodine per day or a big gap, therefore, even if hyperthyroidism patients, pregnant or breastfeeding, you must be appropriate iodine supplementation.