Pain in the middle of the two chests can be caused by the following reasons: 1, digestive system diseases: If pain occurs in the lower part of the sternum or near the saber, it may be caused by stomach, such as gastritis, gastric ulcer or duodenal ulcer and other pain, usually accompanied by belching, bloating, nausea or epigastric pain, etc. 2, heart disease: For example, coronary heart disease, angina pectoris, myocardial infarction, etc., may occur, The pain may occur in the middle of the two chests, that is, behind the sternum, but it is usually accompanied by chest tightness, palpitations and other manifestations. 3, non-specific pain: If there is no above-mentioned situation, but only local pain, pressure pain, or pain when deep breathing thoracic activities, it may be caused by inflammation of the soft tissues near the sternum, such as sabotitis, thoracic costochondritis, etc. 4, rare causes: Blood disorders may also cause sternal pain.