Aphthous stomatitis (also known as canker sores) is characterized by frequent recurrent mouth ulcers. The cause of these painful, mostly benign sores is unknown, but they commonly occur after minimal trauma (e.g., biting the tongue). There are several types of aphthae, all of which can only be treated symptomatically.
- Very frequent
Epidemiological data refers to the US, unless otherwise specified.
- There is no identifiable cause, but are likely multifactorial
- May be associated with systemic or dermatological disorders, malnutrition, infections, or drugs; (e.g., ; , Crohn disease, ; , , , iron deficiency; , methotrexate)
- Often triggered by minimal trauma (e.g., biting the tongue)
- Commonly occur in HIV patients
Subtypes and variants
Minor aphthous ulcers
- Size: 5–10 mm
- Heal within 1–2 weeks without scarring
- Occur in 80% of affected patients
Major aphthous ulcers
- Size: bigger (20–30 mm) and deeper than minor aphthous ulcers
- Prolonged healing over several weeks with scarring
- Size: small (1–3 mm diameter)
- Tendency to cluster
- Bednar aphthae
See “Differential diagnosis” in
The differential diagnoses listed here are not exhaustive.