The thyroid gland can be examined either at the endocrinology department or at the general surgery clinic, and in most cases the examination does not require fasting. The thyroid gland is an endocrine organ and can be examined in the endocrinology department. Generally, thyroid function can be determined by examining thyroid hormone levels, thyroid-related antibodies and other indicators. Ultrasound, thyroid aspiration, and static thyroid imaging can also be used to further clarify whether there are abnormal changes in the thyroid gland. When there is an abnormal position of the thyroid gland, obvious enlargement, compression of the surrounding trachea and esophagus, difficulty in breathing, abnormal swallowing, etc., promptly go to the surgery, and if necessary, surgical treatment can help patients relieve these uncomfortable symptoms. When thyroid function tests are performed, they are generally not required to be performed on an empty stomach. Because of the long half-life of thyroid hormones and their stable nature, the results of a non-fasting test will not be greatly affected. However, if there is an abnormality in thyroid function, routine blood tests, liver function and kidney function should also be completed, which may require fasting. Therefore, which department should be registered for thyroid examination, and whether fasting is required, should be considered in conjunction with the patient’s own situation.