Hyperthyroidism is the abbreviation of hyperthyroidism, hypothyroidism is the abbreviation of hypothyroidism. Hyperthyroidism caused by iodine 131 treatment can be treated by taking levothyroxine as prescribed by the doctor, and the thyroid hormone level can be maintained within the normal range through reasonable treatment, so it is generally not terrible. The main complication of iodine 131 treatment is hypothyroidism, with an annual incidence of 2%~3%. Patients with hypothyroidism may show symptoms such as chills, fatigue, swelling sensation of hands and feet, drowsiness, memory loss, and less sweating, etc. They can take levothyroxine as prescribed by the doctor to relieve the symptoms of hypothyroidism through reasonable alternative treatment. For patients who need to take Iodine 131 treatment, it is recommended to consult a specialized doctor.