Lung cancer, also known as bronchial carcinoma, is a malignant tumor that originates from the epithelial cells of the bronchus or lung. It is the most common type of primary malignant tumor in the lung and has the highest incidence and mortality rates among all types of cancer in China. Most lung cancer patients in China are diagnosed at an advanced stage, and early screening and treatment are crucial to improve survival rates. The main risk factors for lung cancer include old age, smoking, chronic lung inflammation, obstructive pulmonary disease, and exposure to carcinogenic substances such as asbestos, radon, and diesel exhaust. High-risk populations for lung cancer include those who smoke heavily, have a family history of lung cancer, or have been exposed to carcinogenic substances in their workplace. To prevent lung cancer, it is recommended to quit smoking, avoid secondhand smoke, and reduce exposure to carcinogenic substances. Regular low-dose spiral CT scans are also recommended for high-risk individuals. Early symptoms of lung cancer may include coughing, chest pain, and shortness of breath, but many cases are asymptomatic in the early stages. Treatment options for lung cancer depend on the stage and type of cancer, but may include surgery, chemotherapy, radiation therapy, targeted therapy, and immunotherapy. Regular body checks and screenings can help detect lung cancer early, but it is essential to consult a professional doctor for a comprehensive evaluation and diagnosis. In conclusion, lung cancer is a severe disease that can be prevented and treated with early detection and intervention. By understanding the risk factors and taking preventive measures, individuals can reduce their risk of developing lung cancer and improve their chances of survival.