ILLUSTRATED PATIENT GUIDE

Crohn’s disease and ulcerative colitis

Darker areas show example sites of inflammation, not a measure of disease severity.

Crohn’s disease and ulcerative colitis
  1. 1 · Crohn’s disease

    Can affect any part from mouth to anus, commonly the small bowel and colon. Inflamed areas may be separated by healthy bowel, and inflammation can involve the full bowel wall.

  2. 2 · Ulcerative colitis

    Affects the colon and rectum. It usually starts in the rectum and extends continuously, mainly affecting the inner lining.

Both can have active periods and periods of remission. These are general patterns; tests, endoscopy and biopsies establish the diagnosis.

© 2026 Dr. Ibrahim Albedaiwi · Original patient illustrations
Crohn’s & Colitis Foundation: Crohn’s and colitis

These illustrations support education and do not replace your doctor’s advice or follow-up. Plans vary by patient.