The indications for retrograde cholangiopancreatography include the following: 1, the patient is found to have unexplained jaundice and obstructive jaundice; 2, suffering from various biliary tract diseases, such as biliary stones, tumors, sclerosing cholangitis and also stenosing cholangitis, which are not clearly diagnosed; 3, having congenital biliary tract abnormalities or recurrence of symptoms after gallbladder surgery; 4, pancreatic diseases, including pancreatic tumors, chronic pancreatitis, pancreatic cysts, etc. Retrograde cholangiopancreatography can have complications, such as bleeding or even perforation after doing duodenal papillotomy. If the pancreatic duct is inserted by mistake, it can cause complications such as acute pancreatitis or a transient increase in blood amylase after the procedure.