Hidden pain in the middle chest depression may be related to costochondritis, trauma, cardiovascular disease, digestive system diseases and other reasons. 1. Costochondritis: inflammation of cartilage at the connection between ribs and sternum, manifested as localized swelling, pain and obvious pain when pressing. 2. Trauma: impact and other traumatic injuries caused by local soft tissue damage or rib fractures, can cause vague pain symptoms, localized skin lesions or bruises. 3. Cardiovascular diseases: such as myocardial ischemia, due to tissue ischemia, hypoxia state, can be involved in the middle of the chest depression hidden pain. 4. Digestive system diseases: such as reflux esophagitis, when the stomach contents flow back into the esophagus, it can cause damage to the esophageal mucosa, appearing in the middle of the chest depression hidden pain phenomenon. Hidden pain in the middle chest depression can also be seen in other diseases, and it is recommended that patients seek medical treatment in time to avoid delaying the condition.