Hyperthyroidism needs to be diagnosed comprehensively through various tests and the causes of hyperthyroidism should be examined. The main tests include blood tests, ultrasonography and thyroid nuclear imaging. 1. Blood test: Blood test can directly check the thyroid function to determine whether there is hyperthyroidism, and can also detect thyroid-related antibodies to determine whether it is caused by abnormalities in immune factors. It is also necessary to do liver function and blood routine test, in the process of treating hyperthyroidism, the use of drugs may cause liver function and blood routine abnormalities, need to monitor the changes of liver function and blood routine. 2. Ultrasonography: ultrasonography can be used to determine the size of the thyroid volume, blood flow status and whether there are organic lesions. 3. Thyroid nuclear imaging: the examination can determine whether there are high-functioning adenomas and other lesions. Patients with hyperthyroidism need to consult a doctor for timely observation and standardized treatment after diagnosis of the cause of the disease to avoid delays.