Screening methods for lung cancer include chest X-ray, CT, sputum exfoliative cytology, serum tumor markers, fiberoptic bronchoscopy and other tests. Lung cancer refers to malignant tumors occurring in the trachea, bronchus and lungs, with clinical manifestations of paroxysmal irritating choking cough, blood in sputum, wheezing, chest tightness, chest pain, fever, hoarseness and other symptoms, which can be screened by lung X-ray, CT, fibreoptic bronchoscopy, sputum exfoliative cytology, and serum tumor markers. Chest X-ray, CT and other imaging examinations can be used for initial screening to determine the location and size of the lesion, combined with sputum exfoliative cytology, serum tumor markers and other laboratory tests can be used for preliminary diagnosis. Fiberoptic bronchoscopy is able to directly observe the lesion site and can be used to perform pathological biopsy under the microscope, and the pathology is the gold standard for confirming the diagnosis. If lung cancer is suspected, one can consult a doctor for timely examination and screening determination under the guidance of a doctor.