Hyperthyroidism is the abbreviation for hyperthyroidism, a thyrotoxicosis caused by excessive production of thyroid hormones by the thyroid glands themselves. To confirm that you have hyperthyroidism, we mainly look at clinical manifestations and laboratory tests. The symptoms of hyperthyroidism mainly include: excessive eating, weight loss, fear of heat, excessive sweating, palpitations, agitation, irritability, insomnia, weakness, increased stool frequency or diarrhea, protruding eyes, enlarged thyroid gland, and scanty menstruation in women. If a patient has these symptoms, hyperthyroidism should be suspected and then confirmed after further tests. Commonly used clinical tests for hyperthyroidism are: 1. Thyroid stimulating hormone (TSH): changes in serum thyroid stimulating hormone concentration is the most sensitive indicator to respond to thyroid function; 2. Serum total thyroxine (TT₄): this indicator is stable and reproducible, and is one of the main indicators to diagnose hyperthyroidism; 3. Serum free thyroxine (FT 3. serum free thyroxine (FT₄) and free triiodothyronine (FT₃): the main indicators for the diagnosis of clinical hyperthyroidism; 4. serum total triiodothyronine (TT₃); 5. 131I uptake rate: in hyperthyroidism, the 131I uptake rate shows an increase in total uptake and a shift in the peak uptake; 6. TSH receptor antibody (TRAb) is one of the important indicators for identifying the cause of hyperthyroidism and diagnosing diffuse toxic goiter. 7. anti-thyroglobulin antibody (TGAb) and anti-thyroid peroxidase antibody (TPOAb): they are often increased in hyperthyroidism; 8. electronic computerized X-ray tomography (CT) and thyroid ultrasonography; 9. thyroid radionuclide scan, etc. Therefore, when one shows some symptoms of hyperthyroidism, one should go to the hospital for examination in time. Only through formal and systematic examination can the final diagnosis be confirmed.