Mouth ulcers - Comprehensive articles covering over 1,700 topics. The articles are organized by the disease, condition overview, symptoms, treatment, and prevention.

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Mouth ulcers


Mouth ulcers are sores or open lesions within the mouth, caused by various disorders. (See also mouth sores or canker sores)

Alternative Names

Oral ulcer; Stomatitis - ulcerative; Ulcer - mouth


Mouth ulcers are caused by many disorders. These include:

The skin lesion of histoplasmosis may also appear as a mouth ulcer.

Canker sores are more common in young adults than in children or older adults.


  • Pain or discomfort in the mouth
  • Presence of open sores in the mouth
The appearance and exact location of lesions varies with the specific disorder.

Exams and Tests

A health care provider or dentist usually diagnoses the type of mouth ulcer, based on the appearance and location of the lesion. Blood tests or a skin biopsy of the ulcer may be needed to confirm the cause of the problem.


The goal of treatment is relief of symptoms. The cause, if known, should be treated. Gentle, thorough oral hygiene may relieve some of the symptoms. Topical (rubbed on) antihistamines, antacids, corticosteroids, or other soothing preparations may be recommended for applying on top of the ulcer. Avoid hot or spicy foods, which often increase the pain of mouth ulcers.

Outlook (Prognosis)

The outcome varies depending on the cause of the ulcer. Many mouth ulcers are benign and heal without specific treatment. Rarely, chronic mouth ulcers can develop into oral cancer.

Possible Complications

  • Cellulitis of the mouth, from secondary bacterial infection of ulcers
  • Dental infections (tooth abscesses)
  • Oral cancer
  • Spread of contagious disorders to other people

When to Contact a Medical Professional

Call for an appointment with your health care provider if your mouth ulcers persist for longer than 3 weeks. Call for an appointment with your health care provider if mouth ulcers return frequently, or if new symptoms develop.


Good oral hygiene may help in the prevention of some types of mouth ulcers. It may also help to prevent some complications from mouth ulcers. Good oral hygiene includes brushing the teeth at least twice per day, flossing at least daily, and getting regular professional dental cleaning and examination.

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