Hyperthyroidism is the abbreviation of hyperthyroidism, hypothyroidism refers to hypothyroidism, if not standardized medication, hyperthyroidism may become hypothyroidism after 2 months of medication. Hyperthyroidism patients need to take propylthiouracil, methimazole and other anti-thyroid drugs to inhibit the synthesis of thyroid hormones, reduce the level of thyroid hormones in the blood, if the dose of medication is too large at this time may make the level of thyroid hormones in the blood is reduced too much, or even lower than the normal range of thyroid hormone levels, then hypothyroidism will occur. However, if hyperthyroidism patients are standardized in the use of medication, careful adjustment of the dose of medication can help to avoid hypothyroidism. Patients diagnosed with hyperthyroidism can take medication under the guidance of a doctor, and if low thyroid hormone levels occur after taking medication, it is recommended to go to the hospital for consultation.