Lung cancer can usually be detected by doing chest X-ray, and chest X-ray is an important means to detect lung cancer. Lung cancer is a malignant tumor originated from bronchial mucosa or glands in the lungs, which belongs to common primary malignant tumors of the lungs. Patients may have symptoms such as cough, blood in sputum, hemoptysis, dyspnea and fever. Chest X-ray is generally a chest X-ray examination, which can find out the location, size, invasiveness to neighboring parts and accompanying inflammatory lesions of lung cancer. Patients can also pass CT examination so as to further verify the location and scope of the lesion, which can be applied to the early screening of lung cancer. Patients can also use bronchoscopy, mediastinoscopy, cytology and laboratory tests to get a comprehensive understanding of the lesions of lung cancer, which can provide the basis for clinical treatment. Once diagnosed with lung cancer, patients should actively cooperate with doctors to take relevant treatment measures to avoid delaying the condition. In daily life, patients should ensure sufficient rest time and do not overwork.