Some patients with advanced lung cancer will show hoarseness in the course of the disease, which is related to the invasion of the laryngeal recurrent nerve. For advanced lung cancer, hoarseness is a symptom of metastasis of lung cancer. For lung cancer, when patients have metastasis of supraclavicular lymph nodes or metastasis of hilar lymph nodes, it can produce hoarseness, and there are different clinical manifestations for bilateral or unilateral lymph node metastasis. When the right supraclavicular fossa lymph node metastases, the hoarseness can be caused by touching the right recurrent laryngeal nerve, which has a long clinical pathway on the left side. As the left laryngeal nerve has a longer clinical path, the path of the left laryngeal nerve is reflexed under the aortic arch.