Hidden pain in chest one year after lung cancer surgery should be considered as sternal arthritis, tumor recurrence, and other thoracic organ diseases. 1. Thoracic osteoarthritis: lung cancer surgery is invasive surgery, which damages bone joints and muscle tissues of chest in the process of chest opening. If postoperative care is not proper, or sitting posture is not correct, chronic inflammation of bone joints of chest one year after surgery may lead to vague pain in chest. 2. Tumor recurrence: after bone metastasis occurs in lung cancer patients, they may have sternal pain, which is manifested as vague pain in chest; in addition, if the recurrent tumor invades the pleura, it may also cause pleurisy, which may lead to vague pain in chest one year after lung cancer surgery. 3. Other diseases: If patients usually have acid reflux and belching after surgery and have vague pain in chest, they should consider the possibility of gastritis or reflux esophagitis. If the patient smokes and drinks for a long time, has high blood pressure and diabetes history, he/she should consider whether he/she has coronary heart disease and angina pectoris. One year after lung cancer surgery, the cause of vague chest pain may be other diseases, it is recommended to consult doctor in time to avoid delaying the condition.