<prompt> The most common complication of ERCPAcute pancreatitisAcute CholangitisDuodenal perforationAcute cholecystitis  <response>: ERCP carries additional risks. Pancreatitis occurs in about 5 of patients undergoing ERCP and is seen in up to 25 of patients with sphincter of Oddi dysfunction. Young anicteric patients with normal ducts are at increased risk. Post-ERCP pancreatitis is usually mild and self-limited but may infrequently result in prolonged hospitalization, surgery, diabetes, or death. Bleeding occurs after 1 of endoscopic phincterotomies. Ascending cholangitis, pseudocyst infection, and retroperitoneal perforation and abscess may all occur as a result of ERCP. Common cause of pancreatitis 1. Gallstones including microlithiasis 2. Alcohol acute and chronic alcoholism 3. Hyperiglyceridemia 4. Endoscopic retrograde Cholangiopancreatography ERCP, especially after biliary manometry 5. Trauma especially blunt abdominal trauma 6. Postoperative abdominal and non abdominal operations 7. Drugs azathioprine, 6-mercaptopurine, sulfonarnides, estrogens, tetracycline, valproic acid, anti-HIV medications 8. Sphincter of Oddi dysfunction. 