The recurrence rate of early stage lung cancer after surgery is about 10%-20%, which means the 5-year survival rate of early stage lung cancer is about 80%. What is early stage lung cancer? It is mainly referred to as early stage lung cancer when the tumor is less than 3cm, there is no chest tightness, and the mediastinal and hilar lymph nodes have been cleared and no metastasis has been found. After surgery, the recurrence rate of early stage lung cancer is relatively low, and post-operative adjuvant radiotherapy, chemotherapy and targeted therapy are not needed after surgery. Therefore, early stage lung cancer should be operated as much as possible and the postoperative condition should be closely observed.