Lung cancer belongs to the malignant tumors of the respiratory system, and the general time of lung cancer formation may be different depending on the nature of its pathology and also individual differences. Some highly malignant lung tumors may be formed in a few years, but most of them may be formed in more than ten years or even decades, and there is no way to determine the exact time. If a small lung nodule is found at the beginning and is found to be growing faster during regular review, this suggests that changes may be occurring and further pathology is needed to determine the nature of the tumor. We can consider doing percutaneous lung puncture biopsy or bronchoscopy to take pathology, if the lesion is very small, there is no way to puncture and localize, we can also consider doing thoracoscopic pathology, that is, to do lung nodule resection pathology can only confirm the diagnosis, and some early stage lung cancers can be treated by surgery with very good results. In addition to imaging examination, tumor markers can also be used to assist the diagnosis, commonly used tumor markers include carcinoembryonic antigen (CEA) and squamous cell carcinoma antigen (SCC).