Oral Ulceration and Stomatitis

Oral ulceration and stomatitis covers breaches in the oral epithelium and inflammation of the oral mucosa, ranging from common recurrent aphthous ulcers (canker sores) to ulceration accompanying trauma, infection, drug reactions, systemic disease, and cancer therapy. An ulcer is a loss of epithelium exposing the underlying connective tissue, while stomatitis denotes inflammation of the mouth more broadly.

Definition

An oral ulcer is a full-thickness loss of the surface epithelium of the oral mucosa exposing the underlying lamina propria; stomatitis is inflammation of the oral mucosa, which may or may not be ulcerative, arising from local or systemic causes.

Scope

The topic addresses how oral ulcers are described and classified (single versus multiple, acute versus chronic or recurrent), the major causes of stomatitis, and the diagnostic importance of a non-healing ulcer as a possible sign of malignancy. It treats ulceration and stomatitis as diagnostic categories within oral mucosal pathology rather than offering prescriptions for treatment.

Core questions

• What distinguishes an aphthous ulcer from a traumatic, infective, or neoplastic ulcer?
• How are recurrent aphthous stomatitis subtypes (minor, major, herpetiform) defined?
• When should a persistent oral ulcer raise concern for malignancy or systemic disease?
• What systemic conditions and treatments produce oral ulceration or mucositis?

Key concepts

• Ulcer as full-thickness epithelial loss
• Recurrent aphthous stomatitis (minor, major, herpetiform)
• Traumatic ulceration
• Oral mucositis from chemotherapy or radiotherapy
• Ulceration as a marker of systemic disease
• Non-healing ulcer and malignancy
• Vesiculobullous versus primarily ulcerative lesions

Mechanisms

Oral ulceration results from any process that destroys or fails to maintain the surface epithelium: mechanical or chemical trauma, focal immune-mediated injury as in recurrent aphthous stomatitis, infection, cytotoxic damage to the rapidly dividing basal epithelium during cancer therapy (mucositis), or invasion by neoplasm. Recurrent aphthous stomatitis is understood as a T-cell-mediated immunological reaction in genetically predisposed individuals, often associated with triggers and sometimes with haematinic deficiency or systemic disease, although its precise cause remains incompletely defined. The clinical pattern, duration, and number of ulcers, together with biopsy when an ulcer fails to heal, guide diagnosis.

Clinical relevance

Distinguishing benign, self-limiting ulcers from those signalling systemic disease or malignancy is central to oral diagnosis, and a persistent or non-healing ulcer is a recognised indication for biopsy. This entry explains how ulceration and stomatitis are classified and interpreted; it is reference material and not guidance for diagnosing or treating an individual.

Epidemiology

Recurrent aphthous stomatitis is among the most common oral mucosal conditions, affecting a substantial minority of the population at some point, with onset often in childhood or adolescence; oral mucositis is a frequent complication of chemotherapy and head-and-neck radiotherapy, and traumatic ulcers are encountered routinely in dental practice.

Evidence & guidelines

Evidence on oral ulceration combines oral medicine textbooks and narrative reviews of recurrent aphthous stomatitis with condition-specific reviews; the literature emphasises clinical pattern recognition and biopsy of non-healing ulcers, and management of mucositis is addressed in supportive-care guidelines outside the scope of this reference entry.

History

Aphthous ulceration has been described since antiquity, and twentieth-century oral medicine refined its classification into minor, major, and herpetiform forms and distinguished simple recurrent aphthae from complex aphthosis and ulceration secondary to systemic disease.

Debates

What causes recurrent aphthous stomatitis?

Recurrent aphthous stomatitis is best understood as a T-cell-mediated process in predisposed individuals, but the relative contributions of genetics, microbial, nutritional, and immunological triggers remain debated and no single cause is established.

Seminal works

• jurge-2006
• akintoye-2014
• neville-2016

Frequently asked questions

What is the difference between an ulcer and stomatitis?

An ulcer is a localised full-thickness loss of the surface epithelium exposing the tissue beneath, whereas stomatitis is inflammation of the oral mucosa more generally, which may or may not include ulceration.

Why is a mouth ulcer that does not heal a concern?

Most oral ulcers heal within about two weeks; an ulcer that persists beyond this can be a sign of malignancy or systemic disease and is a recognised indication for biopsy rather than continued observation.