Hidden pain in the middle of the chest is considered to be related to myocardial ischemia, muscle injury, reflux esophagitis and so on. 1. Myocardial ischemia: myocardial ischemia caused by various reasons results in vague pain in the middle of the chest, with pain radiating. 2. Muscle injury: After injury or strenuous exercise, the chest muscles are damaged, and vague pain in the middle of the chest may also occur. 3. Reflux esophagitis: This refers to the reflux of stomach acid into the esophagus and mild pain in the reflex region of the esophagus, such as the middle of the chest, back, shoulders and other places. 4. Costochondritis: When costochondritis occurs, it can also lead to hidden pain under the chest. In addition, leukemia, thymoma, etc. can also lead to chest pain, patients need to go to the regular hospital for CT examination, etc., to determine the cause of the disease, and active treatment to avoid further aggravation of the condition.