https://my.clevelandclinic.org/health/diseases/21766-mouth-ulcer
Health conditions associated with mouth ulcers
Certain health conditions, including many autoimmune diseases, can also cause mouth ulcers. These conditions may include:
- Vitamin deficiencies.
- Viral, bacterial or fungal infections.
- Crohn’s disease.
- Celiac disease.
- Reactive arthritis.
- Lupus.
- Behçet’s disease
