Lung cancer is a common malignant tumor of the respiratory system. Generally lung cancer may have some symptoms, i.e. precursors, such as having an unexplained persistent cough, some may have hemoptysis, and there may be weight loss. Generally lung cancer may have a history of smoking or people who do not smoke may also have the possibility of getting lung cancer. Generally, persistent cough must be taken seriously and go to hospital for further lung CT examination. If occupying lesions are found through CT, further bronchoscopy or percutaneous lung aspiration biopsy is needed to clarify the pathological diagnosis. After the diagnosis of lung cancer is confirmed, surgery is the main treatment if it can be performed, and post-surgery can be combined with radiotherapy and chemotherapy. If the disease is found to be late and there is no way to operate, only palliative radiotherapy and targeted drugs can be used.