Lung cancer is clinically divided into two major categories: small cell lung cancer and non-small cell lung cancer. Depending on the pathological type, non-small cell lung cancer includes squamous cell carcinoma, adenocarcinoma, large cell carcinoma, adenosquamous carcinoma and sarcomatoid carcinoma. Depending on the classification, treatment options differ. The treatment for small cell lung cancer is mainly radiotherapy and chemotherapy; for non-small cell lung cancer, it includes surgery, radiotherapy, chemotherapy and targeted therapy. Lung cancer is divided into four stages: surgery is preferred for stage I, II and IIIA patients, and adjuvant chemotherapy is chosen after surgery according to the pathological stage; for stage 3B and IV patients, that is, locally advanced and late-stage lung cancer, chemotherapy is the main treatment and radiotherapy is supplementary. For non-squamous non-small cell lung cancer, targeted therapy can be chosen if the patient is older and cannot tolerate chemotherapy.