This is mainly due to the fact that in order to avoid damage to the laryngeal nerve during thyroid surgery, the nerve is deliberately exposed and dissected throughout the surgery, but the blood supply of the nerve will inevitably be affected during the dissection process, or even stretched or burned, resulting in a certain degree of injury to the nerve, and the patient may experience strained speech, low voice, or even hoarseness after surgery, but this phenomenon is mostly temporary, and most patients will improve significantly in about three months. The majority of patients will improve significantly and gradually disappear in about three months. The use of an intraoperative recurrent laryngeal nerve monitor can significantly reduce the rate of injury to the recurrent laryngeal nerve.