abdominal angina accessory digestive gland achalasia achlorhydria acute liver failure acute pancreatitis alcoholic hepatitis alcoholic liver disease amoeba amoebiasis anal abscess anal fissure anal fistula angiodysplasia antibiotic anus appendicitis ascending cholangitis atrophic gastritis autoimmune hepatitis bile duct biliary dyskinesia biliary fistula blind loop syndrome boerhaave syndrome bowel obstruction campylobacter campylobacteriosis cholangitis cholecystitis choledocholithiasis cholestasis cholesterolosis of gallbladder chronic pancreatitis ciprofloxacin cirrhosis coeliac disease colitis collagenous colitis common bile duct congenital diaphragmatic hernia constipation cushing ulcer diaphragmatic hernia diarrhea diffuse esophageal spasm digestive disease digital object identifier direct inguinal hernia diverticulitis diverticulosis duodenitis duodenum dyspepsia entamoeba histolytica enteritis enterocolitis enteropathy esophageal candidiasis esophageal disease esophageal motility disorder esophageal stricture esophagitis exocrine pancreatic insufficiency fatty liver fecal impaction feces femoral hernia functional colonic disease gallstone gastric antral vascular ectasia gastric dumping syndrome gastric volvulus gastritis gastroenteritis gastroenterology gastroesophageal reflux disease gastrointestinal bleeding gastroparesis gastroptosis haemobilia hematemesis hematochezia hemoperitoneum hepatic encephalopathy hepatic veno-occlusive disease hepatitis hepatorenal syndrome hereditary pancreatitis hernia hiatus hernia ileitis ileum ileus incisional hernia indirect inguinal hernia infection inflammatory bowel disease inguinal hernia intestinal pseudoobstruction irritable bowel syndrome ischemic colitis jejunum lactose intolerance large intestine liver liver abscess liver disease liver failure lower gastrointestinal bleeding lymphocytic colitis macrolide malabsorption mallory-weiss syndrome medical subject headings megacolon megaesophagus melena mesenteric ischemia metronidazole microscopic colitis milroy disease necrotizing enterocolitis non-alcoholic fatty liver disease nutcracker esophagus nutmeg liver obturator hernia ogilvie syndrome oral rehydration therapy pancreatic disease pancreatic fistula pancreatic pseudocyst pancreatitis peliosis hepatis peritonitis pneumoperitoneum portal hypertension portal hypertensive gastropathy postcholecystectomy syndrome primary biliary cirrhosis primary sclerosing cholangitis proctalgia fugax proctitis pseudomembranous colitis pyloric stenosis radiation proctitis rectal prolapse rectum rokitansky-aschoff sinuses salmonella enterica salmonellosis shigella shigellosis short bowel syndrome small intestine spigelian hernia spontaneous bacterial peritonitis steatorrhea stomach disease toxic megacolon tropical sprue ulcerative colitis umbilical hernia upper esophageal sphincter upper gastrointestinal bleeding vaccine vascular disease vermiform appendix viral hepatitis volvulus