The main cause of endemic goiter is usually related to iodine deficiency in the region where it occurs, usually in the inland or mountainous areas far away from the coast, and China is a relatively serious iodine deficiency area. Long-term iodine deficiency in the body affects the synthesis of thyroid hormones and the development of the thyroid gland, which makes people susceptible to endemic goiter, i.e., “big thick neck disease”. Therefore, the state is mandating the promotion of iodized salt in iodine-deficient areas. In addition, people living in these areas should eat more seafood rich in iodine, such as kelp and seaweed, which can also prevent endemic goiter. After the disease, you must go to a regular hospital for examination in time, and choose a suitable way of treatment according to your symptoms and actual problems. During the treatment of thyroid disease, you should also arrange your diet reasonably, and try to eat more iodine-containing foods, or you can choose your diet appropriately according to your doctor’s advice, so that your body can recover health as soon as possible.