The clinical symptoms of acute pancreatitis vary greatly, and may manifest as acute epigastric pain, abdominal distension, nausea and vomiting, peritonitis, and other symptoms. 1. Abdominal pain: often occurring suddenly after a full meal and alcohol consumption, the abdominal pain is severe, mostly located in the left epigastrium, radiating to the left shoulder and left lumbar back. In biliary origin, the abdominal pain starts from the right upper abdomen and gradually moves to the left side. When the lesion involves the whole pancreas, the pain is wider and radiates to the lower back in the form of a band. 2. Abdominal distension: it often coexists with abdominal pain. The more serious the retroperitoneal inflammation is, the more obvious the abdominal distension is. The abdominal distension can be aggravated by the accumulation of fluid in the abdominal cavity, which can lead to the cessation of defecation and gas evacuation. 3. Nausea and vomiting: it can appear at the early stage, and the vomiting is often severe and frequent. Abdominal pain is not relieved after vomiting. 4. Signs of peritonitis: In acute edematous pancreatitis, the pressure pain is mostly limited to the upper abdomen, and there is often no obvious muscle tension. In severe acute pancreatitis, the abdominal pressure pain is obvious, may be accompanied by muscle tension and rebound pain, the scope is wider, may involve the whole abdomen. 5. Other: Mild acute pancreatitis may not be febrile or mildly febrile. When pancreatic necrosis is accompanied by infection, the fever is persistent. In severe pancreatitis, there may be a rapid pulse, drop in blood pressure, or even shock. The symptoms of acute pancreatitis are complex and varied, if you have the above symptoms, you should go to the regular hospital in time to avoid delaying the condition.