Thyroid diseases that require iodine supplementation are called iodine deficiency disorders, and can only be prevented and treated with iodine supplementation. In some parts of China, especially in the middle and western mountainous areas, due to the distance from the sea, soil and water with low iodine content, iodine deficiency can cause endemic goiter disease, commonly known as “thick neck disease”. Symptoms include a swollen neck and low thyroid function. If pregnant women get this disease, causing infants with neurological and other systemic developmental disorders, resulting in short stature, mental dullness, medically known as “cretinism, dull small disease”. Many people have a thyroid disease mistaken for this “thick neck disease”, in fact, is not right. China’s nationwide salt iodization since, has been the basic path to eliminate iodine deficiency disorders. People should not find the neck enlargement on their own iodine supplementation, but should be timely hospital consultation. If you suffer from thyroid disease without iodine supplementation, such as the amount of iodine supplementation, it will cause adverse consequences.