Distinguishing between lung cancer and other occupational diseases of the lung can be done from pathological biopsy, lesion characteristics, clinical symptoms and so on. 1. Characteristics of lesions, lung cancer and other locoregional diseases of lung can be identified by CT, enhanced CT, etc. If the lesions are regular in shape, smooth around and without burrs, most of them belong to benign locoregional diseases of lung; if the edges of the lesions are not smooth, with burrs, burrs, etc., they are most likely to be lung cancer. 2. Pathological biopsy, which is a very important means and also the gold standard examination, is performed through puncture to extract tissues from the lesion area for pathological analysis, so as to determine the specific nature of the lesion, and the accuracy can reach 100%. 3. Clinical symptoms: cough, sputum, hemoptysis, chest pain, low-grade fever, emaciation, fatigue, night sweats (sweating abnormally after going to sleep, and sweating stops after waking up), etc., which need to be differentiated by relevant tests such as blood test and sputum test for tuberculosis bacteria.