Laryngoscopy is required in principle before thyroid surgery because the operation of thyroid surgery is mainly in the neck, and if there is inflammation or growth of a foreign body in the larynx, and the patient has problems or lesions in the vocal cords, it is better to need to confirm the diagnosis before surgery, otherwise the risk of surgery increases. The relevant preoperative examination is done because similar dangers have occurred in the history of disease treatment, which is why the patient is required in principle, in order to prevent irreversible intraoperative factors. General preparation also includes eliminating the patient’s ideological concerns and fears, giving appropriate sedatives and sleeping agents, checking the cardiovascular system, and completing other tests, including X-rays of the neck or trachea, cardiac function, etc.