Ulcerative colitis manifests in various types, categorized by the extent and location of inflammation within the large intestine. These classifications include:

* Ulcerative Proctitis: Inflammation strictly limited to the rectum.
* Proctosigmoiditis: Inflammation affecting the rectum and an adjacent, short segment of the sigmoid colon.
* Left-Sided Colitis: Inflammation that begins in the rectum and extends through the descending colon, typically up to the splenic flexure.
* Pancolitis (or Universal Colitis): Inflammation involving the entire colon.