Dry cough caused by lung cancer is mainly due to the stimulation of bronchial mucosa by tumor tissues. It is characterized by the fact that the cough is usually high-pitched metallic sound, which can last for several months and cannot be relieved, and has no correlation with the weather and seasons, and the effect of general cough suppressants is also poor. In some patients, coughing is severe and can lead to rib fracture. Dry cough of lung cancer is especially obvious in squamous cell carcinoma of lung, which can be accompanied by obvious hemoptysis and chest pain. Sometimes, even necrotic tumor tissues can be coughed out. When malignant tumor tissues invade large blood vessels in the lungs, persistent dry cough can lead to hemoptysis, resulting in asphyxiating respiratory distress in the lungs and threatening the patient’s life. In conclusion, dry cough caused by lung cancer is different from dry cough caused by ordinary chronic bronchitis, pneumonia and other benign lung lesions, which lasts for a long time and worsens progressively, and the general treatment effect is poor, so it needs to be taken seriously.