SPENCER SUTTON / SCIENCE PHOTO LIBRARY SPENCER SUTTON / SCIENCE PHOTO LIBRARY
Illustration showing effects of ulcerative colitis on intestinal walls. Ulcerative colitis is an inflammatory bowel disease affecting the inner lining of the large intestine. The disease is characterized by the development of ulcers which begin damaging the mucosal lining, causing inflammation and progressive loss of blood. Severe cases may progress into the growth of pseudopolyps, and patients become more at risk of developing colorectal cancer.
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