For a patient suspected of having lung cancer, a detailed medical history should be inquired, including whether the patient has long-term smoking, chronic respiratory disease, family history of tumor, and exposure history of carcinogenic occupation. If there are such cases, we should be highly suspicious, and then carry out relevant examinations, including lung X-ray examination, which is the most basic method to diagnose lung cancer. Now we have chest CT scanning and magnetic resonance imaging, which can more clearly show the lesions in the lungs and mediastinum. Other examinations can also include the examination of sputum exfoliated cells, whose positive rate can reach 80%. However, it must have sputum coughed up in the depth of the trachea, so that the positive rate of submission for examination will be higher. Bronchoscopy has become the most important method to diagnose lung cancer. Biopsy or scraping can be performed under bronchoscopy, and its positive rate can reach 80%.
