After lung cancer surgery, smoking should be prohibited to avoid promoting recurrence. For those with reduced lung function, patients should be instructed to gradually increase the amount of exercise. If there is any recurrence, the patient should immediately go to the hospital to ask the physician for consultation and decide whether to carry out radiotherapy or chemotherapy. Squamous lung cancer is easy to invade local area after surgery and cause recurrence in the chest cavity. Adenocarcinoma of the lung or undifferentiated carcinoma can easily metastasize to lymph nodes, bone, liver, brain and the opposite lung. Patients should always pay attention to whether there is fever, severe cough, sputum and blood, shortness of breath, chest pain, headache, change of vision, liver pain, bone pain, enlarged supraclavicular lymph nodes, hepatomegaly, etc. If the above symptoms are observed, patients should go to the hospital in time. Meanwhile, patients should go to hospital regularly for chest X-ray examination and keep fresh sputum to check cancer cells.