Hypothyroidism is short for hypothyroidism. Elevated thyroid stimulating hormone (TSH) and decreased triiodothyronine (T3) and thyroxine (T4) are hypothyroidism. For patients considering hypothyroidism, further search for the cause of hypothyroidism is needed. If anti-thyroid peroxidase antibodies are positive, the cause of hypothyroidism can be considered autoimmune thyroiditis. Treatment of hypothyroidism is based on levothyroxine replacement therapy. Laboratory test results should be interpreted by a professional physician, and it is recommended that patients go to the endocrinology department of a regular hospital for a detailed consultation and follow the doctor’s instructions.