Reduced chest pain of lung cancer may be a phenomenon of improvement. Chest pain is a typical clinical symptom of lung cancer, which is mostly progressive and becomes more and more obvious as the condition worsens. If patients actively take targeted radiotherapy, chemotherapy and other comprehensive treatments to reduce the size of the tumor and alleviate the condition, the chest pain will be alleviated, which is considered as a phenomenon of the improvement of the condition. If the patient cannot be judged by a single symptom, it is also necessary to improve the blood routine, chest CT and other tests to see the level of corresponding tumor markers and the size of the tumor, if there is a significant improvement, it means that the patient’s condition has improved; if there is still no significant change, then it is necessary to continue the treatment.