The thyroid gland is an endocrine organ of the human body, located under the skin on both sides of the trachea at the front of the neck, in the shape of a butterfly, with a size of about 30 g. The main function of the thyroid gland is to secrete thyroid hormones, which play a large role in the human body, simply put, mainly to promote the body’s energy metabolism, maintain normal body temperature, promote The main function of thyroid hormones in the body is to promote energy metabolism, maintain normal body temperature and promote human growth and development, especially the development of the nervous system in infants and children. Of course, the thyroid gland does not only secrete thyroid hormones, but also has other endocrine functions, such as calcitonin. Its main role is to participate in the body’s calcium and phosphorus metabolism, helping to maintain the body’s calcium and phosphorus balance.