Early symptoms of lung cancer are mainly coughing and coughing sputum, and occasionally blood in sputum. Generally, there are no obvious manifestations such as back pain and headache. If the early stage of lung cancer can be removed by surgery and systemic lymph node dissection, the 5-year survival rate of early lung cancer is about 60%-80%, and some of them can even survive for a long time. The prerequisite is that the lung cancer is really in early stage. How to detect early stage lung cancer? It is mainly through low-dose lung CT, which has detected the occupying lung lesions, and puncture biopsy of the occupying lung disease to diagnose early lung cancer.