Hyperthyroidism is the short form of hyperthyroidism. Hyperthyroid patients who need blood tests are usually considered for thyroid function tests, and they are usually able to eat before the thyroid function test, but not if they are also checking their liver function and other things. Thyroid function tests are required for thyroid disorders and can help diagnose hyperthyroidism, hypothyroidism and other disorders, and can also be used to assess the effectiveness of treatment for patients with thyroid disorders, with the main items being total thyroxine, free thyroxine, thyroid stimulating hormone, free triiodothyronine and total triiodothyronine. Since eating does not interfere with the thyroid function test, hyperthyroid patients are allowed to eat before the blood test. It should be noted that fasting is required for liver function and fasting blood sugar tests. Patients diagnosed with hyperthyroidism should cooperate with their doctors and undergo regular review.