Digestive Diseases information from NIDDK – the National Institute of Diabetes and Digestive and Kidney Diseases Health Information Center. Find information on celiac disease, Crohn’s Disease, constipation, diarrhea, diverticular disease, gallstones, hemorrhoids, irritable bowel syndrome (IBS), lactose intolerance, liver disease (including cirrhosis and transplants), pancreatitis, hernia, stomach ulcers, sigmoidoscopy, colonoscopy, upper GI, ERCP, more. Site by NIH