doctor and patient with rectum and hemorrhoids human anatomical model in hospital, inflamed vascular structure

abdomen anatomical anatomy body bowel cancer care child colon coloproctology constipation diagnosis diagnostics digestion digestive disease doctor erosions fissure gastrointestinal health healthcare hemorrhoid hemorrhoids hospital human inflamed internal intestinal intestine medicine model organ pain patient physician polyps proctologist rectal rectum science structure surgery symptoms system teenager tract treatment ultrasound vascular