Hypothyroidism caused by autoimmune thyroiditis and surgical resection is generally incurable and requires lifelong medication; hypothyroidism caused by subacute thyroiditis may be cured. The causes of hypothyroidism include autoimmune thyroiditis (Hashimoto’s thyroiditis, atrophic thyroiditis, etc.), thyroid surgery or radioactive iodine treatment leading to destruction of the thyroid gland, congenital hypothyroidism, etc. Hypothyroidism caused by the above reasons usually cannot be completely cured, and requires lifelong treatment with levothyroxine sodium tablets, but the prognosis is better after standardized treatment. Temporary hypothyroidism caused by subacute thyroiditis and overdose of antithyroid medication can be cured. Subacute thyroiditis is a self-limiting disease, the development of the disease to a certain stage can recover on its own, only symptomatic treatment can be used, such as with pain symptoms can be used to ibuprofen pain, the symptoms of the use of non-steroidal anti-inflammatory drugs to treat the symptoms of poor treatment can be used to treat the prednisone and other medications, but a small number of patients can be developed into a permanent hypothyroidism. Hyperthyroidism can also be caused by an overdose of antithyroid drugs such as propylthiouracil, which can be restored by reducing or stopping the drug. Patients diagnosed with hypothyroidism should actively cooperate with their doctors to improve their prognosis.