Hypothyroidism will have symptoms of psycho-neurological, circulatory, digestive, respiratory, hematologic, reproductive and other systems. Different causes of hypothyroidism will lead to different treatments, which usually require levothyroxine sodium tablets as replacement therapy. 1. Psycho-neurological symptoms: mental retardation, decreased intelligence, memory, etc. Some patients may have drowsiness or even coma. 2. Circulatory system symptoms: bradycardia, weak heart sounds, etc. 3. Digestive system symptoms: gastrointestinal dysfunction such as weakening of gastrointestinal peristalsis and loss of appetite. 4. Respiratory system symptoms: insufficient alveolar ventilation, carbon dioxide anesthesia, etc. 5. Hematological symptoms: some patients may have anemia. 6. Reproductive system symptoms: male may have impotence, female may have amenorrhea, etc. Primary hypothyroidism, such as autoimmune thyroiditis, in which case it is usually necessary to take levothyroxine sodium tablets for life. Central hypothyroidism, such as pituitary tumors, in which case it is necessary to treat the primary disease first, and then apply levothyroxine sodium tablets according to the condition. When you suffer from hypothyroidism, you should go to the hospital in time, actively cooperate with the doctor’s treatment, and follow the doctor’s instructions for medication.