Dilatation of the bile ducts and pancreatic ducts can be secondary to a variety of diseases in addition to congenital dilatation. 1. Secondary bile duct dilatation can be seen in bile duct parasites, post-cholecystectomy, chronic cholecystitis with stone embedded in the neck, sphincter of Oddi relaxation, duodenal bulbous ulcer pulling and compression, pancreatic head carcinoma, chronic pancreatitis or pancreatic head cysts, sedimentary or conical stones in the lower part of common bile duct, stone embedded, injurious bile duct stenosis and tumors, including cholangiocarcinoma, metastatic carcinoma of hepatic hilum, carcinoma of juxta-pituitary periphery, carcinoma of the pancreatic head, and so on. 2. Dilatation of pancreatic ducts can be seen in pancreatic cancer, duodenal papillary carcinoma, carcinoma of the end of common bile duct, jugular abdominal carcinoma, pancreatic intraductal papillary mucinous tumor, pancreatitis, pancreatic pseudocyst, sphincter of Oddi dysfunction, pancreatic injury, pancreatic schizophrenia, ring pancreas, pancreatic tuberculosis, abdominal aortic aneurysm, and parasitic infections, and so on. Found bile duct and pancreatic duct dilatation, in addition to the need to go to the hospital in time, clear diagnosis and treatment plan, under the guidance of the doctor to use drugs, avoid self-medication.