Blood in sputum one year after lung cancer surgery is not normal, which may be caused by recurrence or metastasis of the patient’s disease. The main symptoms of lung cancer recurrence are cough, sputum, blood in sputum, chest pain, and so on. The main symptoms of lung cancer recurrence are coughing, coughing up sputum, blood in sputum, chest pain, etc. It is not normal for lung cancer patients to have blood in sputum one year after surgery, which is mostly considered to be caused by recurrence of lung cancer and metastasis of cancer cells. Cough, hemoptysis, blood in sputum and other symptoms will appear when lung cancer patients recur, and if patients have metastasis to other tissues or organs, they will have chest pain, hoarse voice, chest water and other symptoms, which are all abnormal. Patients should go to the hospital for examination in time. If lung cancer recurrence is found, according to pathological type and clinical stage, surgery, chemotherapy, radiotherapy and other treatments can be adopted. If patients with postoperative lung cancer have the symptom of blood in sputum, it is recommended to seek medical treatment in time and follow the doctor’s prescription.