Mild pancreatitis is relatively superficial and has fewer complications, but severe pancreatitis, which develops very rapidly and is often accompanied by serious complications, is very critical and can even threaten the life of the patient. Adult respiratory distress syndrome is a common complication, which usually involves shortness of breath, cyanosis of the lips and fingers, chest tightness, cough, bloody sputum, and in critical cases, impaired consciousness and even death. There is also the symptom of bleeding, which is due to the tendency of stress ulcers to occur in severe pancreatitis and lead to gastrointestinal bleeding. Among them, stress ulcer is an acute gastric mucosal lesion, which is mostly accompanied by bleeding. In addition, in severe pancreatitis, there is often local and systemic infection, and the infection usually leads to the formation of abscesses that invade the pancreas or the surrounding intestinal ducts, which can form pancreatic fistulas or intestinal fistulas. Most of the damaged pancreatic ducts can heal on their own, but for large pancreatic duct injuries, the healing time is longer, usually taking 3 to 6 months, and if the fistula does not heal for a long time, then surgery can be considered. Therefore, severe pancreatitis is more serious, and it is combined with bleeding and necrosis of the pancreas, causing local or systemic infection and poisoning, so we should pay great attention when facing this kind of pancreatitis.