The common disease is primary hyperthyroidism, which is characterized by fear of heat, excessive sweating, hand trembling, excessive eating, easy hunger, increased stool frequency, and weight loss. Second, a common disease is Hashimoto’s thyroiditis, accompanied by primary hypothyroidism. Some patients have clinical manifestations such as fear of cold, weakness, drowsiness, unresponsiveness, dry skin, swelling, and in severe cases, bradycardia, pleural effusion, pericardial effusion, dry stools, and anemia. The results of thyroid function check indicate that the level of thyroid hormone is low and the level of thyroid stimulating hormone is significantly elevated. Third, serious long-term iodine deficiency leads to enlarged thyroid neck, mostly without obvious symptoms, some may be accompanied by mild hypothyroidism, multiple thyroid nodules symptoms