Whether or not you need to iodize the salt you eat generally depends on whether or not the area where you have lived for a long time is an iodine-deficient area, and whether or not you have a thyroid disorder. Most inland areas of China are iodine-deficient areas, where iodine obtained from food and drinking water alone cannot meet the needs of the human body, and iodized salt or iodine-rich foods, such as kelp, nori, seaweed, and seafood, need to be consumed. Long-term iodine deficiency may lead to diseases such as cretinism and goiter. Iodine is an important raw material for thyroid hormone synthesis by the thyroid gland. For people with hyperthyroidism, iodine intake should be appropriately restricted, and iodine-rich foods should be eaten as little as possible, and iodized foods are not recommended. It is recommended to follow your doctor’s advice as to whether or not you need to consume iodized salt, and to seek medical attention if you feel unwell.