ulcerative colitis

anatomical anatomy and biology blotchy body bowel cancer chronic closeup colitis colon colonoscopy colorectal crohn crohns diagnosis diagram digestion digestive disease diverticulitis diverticulosis for gastrointestinal health highlighted human illustration inflammation inflammatory internal intestinal intestine large location locations medical medicine organ organs pain rectum science scientific silhouette surface syndrome system tract treatment ulcer ulcerative ulcerosa ulcers use vector