Whether sputum is good or bad after chemotherapy is a question that should be viewed from two aspects: 1. If the patient has lung cancer and the mass is large enough to compress the trachea and cause obstruction, and after chemotherapy, the mass shrinks and the trachea is open and sputum can be discharged, then it is a good thing to have sputum because it indicates that the mass has shrunk and the trachea is open again. 2. In this case, it may not necessarily be a good thing, so the specific problem should be looked at specifically, combined with the patient’s general symptoms, signs, laboratory tests and CT or chest X-ray examination to make a comprehensive judgment, so it is good or bad is different from disease to disease and from person to person.