Gastroenterology experts provide opinions regarding the esophagus, stomach, duodenum, biliary tract, liver, pancreas, gall bladder, small intestine and colon. Gastroenterologists have specialized knowledge of the diagnosis and treatment of illnesses such as appendicitis, colon cancer, esophaegeal cancer, stomach diseases, gastrointestinal motility disorders, chronic diarrhea, inflammatory bowel disease, gastrointestinal cancers, ulcers, and the endoscopic evaluation (endoscopy) of the gastrointestinal tract.