Lung cancer can be cured if it only recurs in a single site and is found in time, while it is more difficult to be treated if it is multiple and found at a late stage. Lung cancer belongs to malignant tumors and is easy to recur and metastasize, once recurrence occurs, it is necessary to determine the recovery situation according to the metastasis and stage. Generally speaking, if the recurrence is only in a single site, and the discovery is timely, and the tumor size is relatively small, there is a chance that the tumor can be cured if it is removed in time through radical surgery, and the tumor is treated with radiotherapy and chemotherapy after surgery. However, if there are multiple sites and multiple recurrences, and the discovery is late and the tumor size is large, comprehensive treatment can only be carried out through targeted therapy, chemotherapy, radiotherapy, etc., to control the disease, improve the quality of life and prolong the survival period.