Letter M
Mouth ulcers
Also known as: Canker sores, Aphthous ulcers
Mouth ulcers symptom guide: what it can mean, possible causes, and when to seek care. Educational only.
Overview
Mouth ulcers (aphthous) often heal within a week. Stress, minor trauma, or nutrient gaps can contribute. Large, lasting, or very frequent ulcers deserve evaluation.
Possible causes
- Aphthous ulcers
- Minor trauma (cheek bite)
- Stress
- Iron/B12 deficiency
- Food allergy (less often)
When to see a doctor
Visit a clinic if ulcers last more than 2 weeks, are large, or come with fever.