Hidden pain in the left mid-abdomen below the ribs, the common clinical causes are gastrointestinal diseases, chronic pancreatitis, costochondritis and so on. 1. Gastrointestinal diseases: common clinical diseases include gastric ulcer, ulcerative colitis, duodenal ulcer, chronic gastritis, etc., and the clinical manifestations of the affected people are hidden pain in the abdomen, acid reflux, belching, nausea, vomiting, and so on. 2. Chronic pancreatitis: local or diffuse chronic progressive inflammation of the pancreas caused by various reasons, accompanied by irreversible damage to the internal and external secretory functions of the pancreas, most often seen in the original existence of biliary tract infections, inflammation, or stones and other diseases of the population, the clinical manifestations of the persistent pain in the upper abdomen, dyspepsia, diarrhea and so on. 3. Costal chondritis: refers to the inflammatory reaction of the cartilage at the junction of the ribs and sternum, which is usually associated with viral infection, chronic strain of the thoracic and rib joint ligaments, and other factors, with clinical manifestations such as pain and swelling of the anterior chest wall. If the symptoms continue to be unrelieved, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor to determine the cause of the disease and targeted treatment, do not take medication on their own, so as to avoid delays in the condition.