Periumbilical discoloration is one of the signs of acute hemorrhagic necrotizing pancreatitis. Acute hemorrhagic necrotizing pancreatitis is a type of acute pancreatitis, which is caused by the continued development of acute edematous pancreatitis lesions. There is extensive necrosis of pancreatic alveoli, fat and blood vessels, edema of pancreatic tissue, increase in size, and extensive hemorrhagic necrosis. The retroperitoneal space is heavily hemorrhagic with exudate. The omentum and tissues of the lining are digested by the exuded pancreatic enzymes. This type of pancreatitis is severe and develops rapidly, with many complications and high mortality. What causes periumbilical discoloration? The causes of this disease are related to the following factors: biliary tract disease is the most common cause in China accounting for -%; pancreatic duct obstruction due to roundworm stones edema tumor or spasm; lesions adjacent to the papillae of the fingers; alcoholism and overeating are the main causes in Western countries; surgery and injury; hypercalcemia and hyperparathyroidism can trigger acute pancreatitis; drugs, certain infectious diseases such as mumps Viral hepatitis, etc. can be associated with pancreatitis. Pediatric acute pancreatitis is relatively rare, and the onset is related to the spillage of pancreatic fluid into the interstitial pancreatic vein and its surrounding tissues. It is now thought to be associated with viral infection, drugs, obstruction of the pancreatic secretory ducts, and certain systemic diseases or overeating. At least half of them are caused by mumps virus or blunt injuries to the upper abdomen, and there are still 30% of cases where the cause cannot be found. The data suggest that acute pancreatitis has a pathophysiological process of acute microcirculatory disorders.