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Ulcerative Colitis

Ulcerative colitis is a chronic inflammatory bowel disease that causes swelling and ulcers in the large intestine. It can lead to abdominal pain and urgent bowel movements.

Prepared from the sources listed below. This overview is educational and is not a diagnosis or treatment plan.

Abstract representation of the human digestive system highlighting the colon area.
Abstract representation of the human digestive system highlighting the colon area.

Overview

A clear starting point

Ulcerative colitis (UC) is a lifelong inflammatory bowel disease that causes chronic inflammation and ulcers in the inner lining of the large intestine (colon) and rectum. This inflammation weakens the intestinal walls and creates sores, leading to symptoms like abdominal pain, urgent bowel movements, and diarrhea that may contain blood or mucus. While the exact cause is unknown, experts believe abnormal immune reactions, genetics, and environmental factors play a role. Although there is no cure, various treatments can help control symptoms, induce remission, and improve quality of life.

Four key facts

  1. 1Ulcerative colitis is the most common type of inflammatory bowel disease and primarily affects the inner lining of the colon and rectum.
  2. 2Symptoms often develop over time and can range from mild to severe, typically occurring in flare-ups followed by periods of remission.
  3. 3Common symptoms include diarrhea (often with blood or pus), abdominal pain and cramping, and an urgent need to empty the bowels.
  4. 4Complications can be serious, such as severe dehydration, severe bleeding, or a rapidly widening colon (toxic megacolon).

Useful points to discuss

Work with your healthcare provider to find a treatment plan that manages your symptoms and maintains remission.
Keep a food diary to identify potential trigger foods, but consult a doctor before making significant dietary changes.
Take prescribed medications consistently, even when feeling well, to reduce the risk of future flare-ups.

When professional care may be important

These examples are not a diagnosis checklist. New, severe, rapidly worsening, or concerning symptoms should be assessed by a qualified healthcare professional; emergencies require local emergency services.

  • Experience severe abdominal pain or constant bleeding from your bottom.
  • Notice large blood clots in your stool or vomit blood.
  • Develop a high temperature, fast heartbeat, or are unable to pass gas or stool.

Source trail

Authoritative references

Source publishers and titles are listed as non-clickable references so this page never sends visitors to another website.

  1. 1. National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK)Ulcerative ColitisPublished or updated 2020-09-01
  2. 2. Centers for Disease Control and Prevention (CDC)Ulcerative Colitis BasicsPublished or updated 2024-06-21
  3. 3. National Health Service (NHS)Ulcerative colitisPublished or updated 2026-08-20
  4. 4. Indian Council of Medical Research (ICMR) / Ministry of Health & Family WelfareGuidelines for the Management of Gastroenterological Diseases