Pain in the middle of the two chests can be considered to be caused by skeletal pain, such as damage to the sternal styloid bones, but it is also necessary to consider pain caused by thoracic costochondritis or upper gastrointestinal diseases. 1. Sternocleidomastoid injury: The main bone tissue in the middle of the two chests is the sternocleidomastoid. Therefore, when there is a localized fracture or fracture of the sternal styloid, it will cause significant pain in the middle of the two chests. 2. Thoracic costochondritis: Thoracic costochondritis refers to the sternum and the cartilage tissue between the sternal styloid and the ribs. Inflammation or damage to the cartilage in this area can also cause pain in the middle of both chests. 3. Upper gastrointestinal diseases: some patients have pain in the middle of the two chests, which may also be directly related to upper gastrointestinal diseases. Acute and chronic gastritis, gastric ulcer, reflux esophagitis, esophageal tumor and other diseases may also cause pain in the middle of the chest. After the appearance of pain in the middle of the two chests, it is recommended to go to the hospital in a timely manner for filming and examination, to be able to quickly determine the cause of pain and timely treatment.