There are many reasons for vague pain in the sternum, such as excessive exercise, tumor, cardiac system diseases, intercostal neuralgia and so on. 1. Costochondritis: strain or trauma can cause costochondritis, which can cause vague pain in sternum. 2. Tumor: Intrathoracic tumor or sternal tumor and other tumor diseases may also cause vague pain in the sternum. 3. Heart system diseases: coronary heart disease and other diseases can also cause vague pain in the sternum, usually in emotional excitement, overwork and other triggers of stimulation triggered by the pain. 4. Intercostal neuralgia: the main symptom of intercostal neuralgia is localized pain, the location of the relative pain is relatively fixed, especially after pressing the local pain will increase. There are many reasons that cause hidden pain in the sternum, it is recommended that patients go to the hospital in time to improve the examination, clear diagnosis, and take standardized treatment according to the doctor’s instructions.