How does ulcerative colitis affect the colon ?

When ulcerative colitis is active, the colon becomes less able to absorb the liquid from the stools, resulting in a larger volume of watery stools. Also, because the inflamed colon cannot hold as much waste
as normal, there will be more frequent bowel actions. This need to empty the bowels may be
extremely urgent, particularly if the rectum is inflamed.

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