Hypothyroidism, also known as hypothyroidism. Patients with this disease have low thyroid function, producing only small amounts of thyroxine, which slows the metabolic process in the body. The main causes of hypothyroidism are: i. Autoimmune hypothyroidism, including chronic lymphatic thyroiditis or idiopathic hypothyroidism. ii. Second, medical hypothyroidism, such as drugs radioactive iodine surgery, etc. Third, endemic iodine deficiency and excess iodine caused. IV. Enzyme-synthesizing hypothyroidism. V. Congenital thyroid deficiency and thyroid dysplasia. Its symptoms mainly include fatigue, loss of appetite, overweight, dull facial expression, unresponsiveness, constipation, chest tightness, shortness of breath. Amenorrhea and infertility in women. Impotence in men, dry and rough skin, thickening, orange skin, recurrence of infection. Droopy and swollen eyes dry and thin hair, especially loss of outer eyebrows, low heart sound, arrhythmia, etc.