Cholecystitis causing pancreatitis is more common, and pancreatitis causing cholecystitis is relatively rare due to the special anatomical relationship. In the abdominal cavity, the descending duodenum, the common bile duct, and the pancreatic duct converge at the juxtaposition of the Vater, where there exists an important anatomical structure, the sphincter of odi, which is a unidirectionally movable flap. When a certain pressure is reached in the common bile duct, the valve opens toward the pancreatic duct, allowing bile to flow to the pancreatic duct for digestion of food, and then closes. So the contents of the pancreatic duct do not flow to the common bile duct; the valve opens to the duodenum, allowing bile to flow to the duodenum for digestion of food, and then closes. So the contents of the duodenum do not flow to the common bile duct. When a biliary tract lesion occurs, the lesion irritates the sphincter of oddi and thus the pancreatic duct system, causing pancreatic disease. Pancreatitis triggered by biliary tract disease is called biliary pancreatitis. Digestive system diseases are common in clinic. Once they occur, they should go to the hospital in time and be diagnosed and treated under the guidance of professional doctors.