Due to the compression of airway area or invasion of pleura or compression of laryngeal nerve, lung cancer patients may have coughing symptoms, which is often an irritating dry cough without or with little sputum. Usually, cough can appear both at night and during the day in the early stage of lung cancer, and some patients may cough more at night than during the day, but it cannot be generalized. Specific causes 1. tracheal stenosis: due to tracheal stenosis caused by tumor growth in the trachea or tracheal stenosis caused by external pressure of tumor, resulting in coughing, which is usually irritating high-pitched metallic sound cough or irritating choking cough; 2. pleural effusion: when lung cancer pleural metastasis causes large amount of pleural effusion and pleural effusion compresses lung tissues resulting in lung atelectasis, patients can also have obvious cough, which is persistent cough with small amount of white mucous sputum Tumor metastasis: the tumor metastasizes to the lymph nodes and the enlarged lymph nodes compress the trachea, resulting in cough. If the laryngeal nerve is compressed, it can be accompanied by hoarseness. If the tumor metastasizes to the pericardium and causes a large amount of pericardial effusion, it can compress the surrounding lung tissues and the patient can have a violent cough, accompanied by obvious breathing difficulties. Treatment For cough in lung cancer, the main treatment method is to treat the primary disease and give corresponding treatment according to different pathological types and stages, such as surgery, radiotherapy and chemotherapy. Bronchoscopic interventions can be given for tumors in the large airways, with the aim of relieving tumor compression. For cough caused by lung cancer metastasizing to the pleura and forming a large amount of pleural fluid, the treatment method is to actively drain the pleural cavity by thoracentesis to reduce the pressure of pleural fluid on lung tissue. If the tumor obstructs the airway secondary to bacterial infection, active anti-inflammatory treatment can be given, and antifungal treatment can be given if secondary to fungal infection.