Hoarseness in lung cancer patients is caused by direct pressure of lung cancer tumor on the recurrent laryngeal nerve or pressure of enlarged lymph nodes on the recurrent laryngeal nerve. At this time, the tumor is often in the middle to late stage and the chance of surgical resection has been lost. If the lesion is relatively limited, simultaneous radiotherapy can be considered. If distant metastases are also found, systemic treatment plans, such as chemotherapy, targeted drug therapy, immunotherapy, etc., need to be formulated according to the type of pathology. If the time of compression is relatively short, the hoarseness may be reduced or even disappeared after the laryngeal nerve compression is released through anti-tumor treatment. However, if the compression is longer and irreparable damage is caused to the recurrent laryngeal nerve, even if the tumor or enlarged lymph nodes no longer compress the recurrent laryngeal nerve, the hoarseness will not be relieved.