The liver and pancreas produce large amounts of bile and pancreatic juice every day, which are discharged into the 12-finger intestine through the bile duct and pancreatic duct to facilitate the digestion and decomposition of food. Normally, the pressure in the pancreatic duct is higher than that in the bile duct, so bile will not enter the pancreatic duct. However, under abnormal circumstances, when the pressure in the bile duct is higher than that in the pancreatic duct, bile will enter the pancreatic duct, which can lead to acute pancreatitis. Because there is no outlet for bile, it is bound to accumulate in the bile ducts, which can increase the pressure in the bile ducts; 3. Other factors, such as heavy alcohol consumption, stimulate bile duct infection and inflammation. Acute pancreatitis occurs in middle-aged people, because: in general, middle-aged people banquet and more meals, whenever the banquet is rich in dishes, good wine temptation, such as in the diet is not restrained, very easy to occur acute pancreatitis. The census data shows that the middle-aged is a good age for gallstones, and gallstones are very likely to cause acute pancreatitis, so there is a reason why acute pancreatitis favors the middle-aged. In order to prevent the occurrence of acute pancreatitis, middle-aged people must pay attention to the following matters: 1, avoid overeating. No matter when, where, what occasion, the diet should be light, avoid eating large fish and meat and other greasy food or alcohol; 2, active treatment of gallstones. According to the literature, 2/3 of patients with acute pancreatitis have gallstones, and 5% of patients with gallstones can cause acute pancreatitis, so those who suffer from gallstones should actively prevent and treat complications of acute pancreatitis.