What is Ulcerative Colitis?

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Ulcerative colitis is a chronic inflammatory disease that affects only the innermost lining of the colon. The severity and extension of inflammation varies in each patient.

It can affect the following areas:

  • Proctitis: affects just the rectum
  • Proctosigmoiditis: affects the rectum and sigmoid
  • Left-sided or distal ulcerative colitis: affects just the left colon (up to the splenic flexure)
  • Pancolitis: those cases which extend beyond the splenic flexure

Most frequent symptoms of Ulcerative Colitis



Blood in the stool

Stools containing mucus and/or blood (rectal bleeding)

several of small stools

A high frequency of small volume stools

frequent urgent defecate

Frequent and urgent need to defecate

nocturnal stools

Nocturnal stools



thermometer fever

Fever, abdominal pain and poor overall health (due to fatigue, loss of appetite and weight loss) are all indicative of the condition’s severity.

Substantiated information by:

Ingrid Ordas Jimenez
Marta Gallego Barrero

Published: 20 February 2018
Updated: 4 September 2020


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