Continuous decrease of thyroid function value may be caused by excessive iodine intake, Hashimoto’s thyroiditis, etc., which needs to be treated according to the cause of the disease. 1. Excessive iodine intake: Excessive iodine intake is usually caused by excessive iodine in drinking water and eating foods high in iodine, etc. In daily life, you should pay attention to a light diet, eat more vegetables and fruits, avoid foods high in iodine, avoid emotional fluctuations, and take rest on time. 2. Hashimoto’s thyroiditis: Hashimoto’s thyroiditis is an autoimmune disease, and in the late stages of the disease, hypothyroidism may occur, which can be treated with drugs such as levothyroxine and glucocorticoids. It is recommended that the patient go to the hospital for examination in time when the above mentioned symptoms occur, and choose the appropriate drugs and programs for treatment under the guidance of the doctor.