The triangle in the center below the ribs is clinically called the upper abdomen or subxiphoid process, and the pain in this area may be related to gastric diseases, pancreatic diseases, cardiac diseases, or it may be caused by injuries to the xiphoid process. 1. Gastric diseases: the triangle in the middle of the lower ribs clinically belongs to the stomach area, the pain here is usually seen in gastric diseases, such as gastritis, gastric ulcer, the main clinical manifestations of pain in the triangle in the middle of the lower ribs, more often than not after eating, for the distending pain or colic, often accompanied by nausea, anorexia and other symptoms. 2. Pancreatic diseases: such as acute pancreatitis, can be manifested as persistent pain in the upper abdomen, ranging from mild to severe, often combined with biliary system diseases or overeating, most of them can be accompanied by fever, nausea, vomiting and abdominal distension and other symptoms. 3. Heart disease: such as lower wall myocardial infarction, acute angina pectoris, due to myocardial ischemia and ischemia causing pain in the precordial region, there may be radiating pain, discomfort or pain in the region. 4. Saber bulge injury: mostly due to trauma, extrusion and other reasons, resulting in soft tissue injury and fracture at the saber bulge, or due to strenuous stretching of the abdominal muscles, resulting in soft tissue hyperplasia of the saber bulge and aseptic inflammation of the surrounding tissues, which can cause pain in this area. If the pain in the middle triangle below the ribcage is not relieved, or accompanied by other symptoms, you should go to the hospital in time, and give targeted treatment after clarifying the cause.