ulcerative colitis. inflammatory bowel disease. ulcer and inflammation of the digestive tract, abdominal pain. human

intestine colitis colon digestive anatomy disease human medical medicine system gastrointestinal illustration inflammation organ pain bowel digestion health large tract ulcer intestinal inflammatory biology internal vector colonoscopy ulcerative cancer diagnosis appendix diagram care science anatomical body gut rectum graphic crohn ibd syndrome diarrhea illness duodenum constipation healthy icon chrons inside