Lung cancer usually occurs in the bronchial mucous touch epithelium. It is also called bronchial lung cancer. Lung cancer accounts for 90-95% of all substantial lung tumors. According to the World Health Organization, lung cancer is currently the number one cause of cancer deaths worldwide, accounting for approximately 19% of all malignancies. Known factors that can increase the risk of the disease are mainly the following: 1. smoking. 2.Atmospheric pollution. 3. Occupational factors. 4. Chronic lung diseases, etc. The most common symptoms of lung cancer are: 1. cough, mostly irritating cough, no sputum or a small amount of white sticky sputum. 2. 2. Hemoptysis, mostly bloody sputum or blood in sputum; 3. Chest tightness and chest pain 4.Fever, mostly persistent and low fever in lung cancer, which is repeatedly delayed. 5.Difficulty in breathing, shortness of breath, etc.