Epigastric left subcostal pain may be caused by pancreatitis, gastritis, gastric ulcer and other reasons. 1. Pancreatitis: The anatomical location of the pancreas is in the left upper abdomen. Pancreatitis is an acute inflammatory disease caused by pancreatic protease digestion of the pancreas and its surrounding tissues, and its first symptom is a pain in the left side of the epigastrium under the ribs. 2. Gastritis, gastric ulcer: Chronic gastritis can be accompanied by pain in the upper left abdomen, abdominal distension, loss of appetite, nausea, vomiting and other symptoms; gastric ulcer patients can have symptoms of hidden pain in the left abdomen, gastric ulcer pain after eating. Based on the left side of the epigastric subcostal pain can not accurately determine the cause, but also need to be combined with the characteristics of the medical history, other test results to make an accurate judgment, it is recommended that the cause of the disease under the guidance of a doctor.