Mouth Sores and Canker Sores in IBD
Content note: Educational content aligned with publicly available patient materials from the Crohn's & Colitis Foundation and other major IBD education sources. Content is used under license from the Foundation for patient education; the Foundation does not endorse IBDPal or MediVue products or services. Last reviewed June 2026. Not individual medical advice.
Educational use only. IBDPal does not provide medical advice, diagnosis, or treatment. Always consult your gastroenterologist or IBD care team for personal decisions.
Painful mouth ulcers are a frequent extraintestinal complaint in Crohn's disease and sometimes in ulcerative colitis. They can track with gut activity, nutrient gaps, or local irritation. Viral sores and medication effects also belong on the list.
Practical steps while you wait for advice
- Choose soft, cool foods and avoid sharp chips or acidic juices if they sting
- Keep hydration steady; dehydration worsens mouth comfort
- Note whether sores rise with stool flares or appear independently
Iron, B12, and folate gaps can contribute; see anemia and iron and iron nutrition guide.
Call sooner if
- You cannot drink enough fluids because of pain
- Ulcers last beyond two weeks or keep expanding
- Fever, severe throat pain, or eye inflammation appears with oral sores
Related: EIM map, eye inflammation, visit prep.
Read the full interactive version on ibdpal.org.