Aphthous Stomatitis
Recurrent painful oral ulcers of unknown etiology — the most common oral mucosal disease
Prevalence: Affects 15-25% of the general population; recurrent aphthous stomatitis (RAS) is the most common oral mucosal disease worldwide
Overview
Aphthous stomatitis (recurrent aphthous stomatitis, RAS; aphthous ulcers; 'canker sores') is characterized by recurrent, painful oral ulcers on non-keratinized mucosa, typically with a yellow-grey pseudomembranous base and an erythematous halo.
Despite extensive research, the etiology remains incompletely understood — it is not caused by the herpes simplex virus (a common misconception) and is not infectious.
RAS significantly impacts quality of life, with recurrent episodes of pain interfering with eating, speaking, and oral hygiene. Severe forms can be incapacitating.
Etiology and Risk Factors
The etiology is multifactorial and incompletely understood. Immunological dysregulation is central: T-lymphocyte-mediated cytotoxicity against oral epithelial cells, with elevated TNF-α, IL-2, and IL-12 in lesion tissue.
Genetic predisposition: first-degree relatives of RAS patients have significantly higher prevalence (90% concordance in identical twins in some studies); multiple HLA associations reported.
Precipitating factors: local trauma (cheek biting, sharp foods, dental injections), emotional stress, hormonal changes (menstrual cycle — some women reliably develop ulcers premenstrually), specific foods (nuts, chocolate, tomatoes, citrus — though evidence is limited).
Nutritional deficiencies — particularly iron, folate, zinc, and vitamin B12 — are found in a subset (10-20%) of RAS patients. Correcting these deficiencies may reduce recurrence frequency.
Systemic disease association: Behçet's disease (major criterion: recurrent oral aphthae + genital ulcers + uveitis), celiac disease (gluten sensitivity), IBD (Crohn's disease, ulcerative colitis), HIV infection, MAGIC syndrome.
Sodium lauryl sulfate (SLS) in toothpastes may be a trigger in susceptible individuals.
Professional Content
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Pathogenesis
Pre-ulceration phase: mononuclear cell infiltrate appears in the lamina propria before clinical ulceration, with CD4+ T cells and activated macrophages predominating.
Classification
Minor Aphthous Ulcers (Mikulicz's aphthae) — 80% of cases
Small, shallow ulcers that heal without scarring.
Major Aphthous Ulcers (Sutton's disease) — 10-15% of cases
Large, deep, painful ulcers that heal with scarring.
Clinical Manifestations
Prodrome (24-48 hours before ulcer): burning or tingling sensation at the site where the ulcer will develop — reported by many RAS patients.
Diagnosis
Diagnosis is primarily clinical — there is no specific diagnostic test for RAS. Based on characteristic appearance, location (non-keratinized mucosa), and recurrent pattern.
Treatment Protocol
Topical Therapy — First Line
Reduce pain, accelerate healing
Prognosis
Minor RAS: each episode is self-limiting (7-14 days) with complete healing. However, the recurrent nature means patients experience ulcers throughout their lives, though frequency may diminish with age.
Prevention
- Identify and avoid personal trigger foods
- Use SLS-free toothpaste
Interactive Quiz
Test your understanding of Aphthous Stomatitis.
Q1. Which location would you NEVER expect to see a recurrent aphthous ulcer (RAS)?
3D Pathology Description
Show an aphthous ulcer on the buccal mucosa — a round, well-defined ulcer with yellow-grey fibrinous pseudomembrane and surrounding erythematous halo on the non-keratinized mucosal surface, with histological cross-section showing T-lymphocyte infiltrate and epithelial destruction.