Mouth Ulcers

Mouth ulcers, also known as oral ulcers or mucosal ulcers, are small, painful lesions that develop on the mucous membranes inside the mouth. They can appear on the tongue, lips, gums, and other areas of the mouth.

Causes

  • Trauma: Accidental biting of the cheek or tongue, or dental work can cause mouth ulcers.
  • Infections: Viral infections such as herpes simplex, hand-foot-and-mouth disease, and chickenpox can cause mouth ulcers.
  • Autoimmune disorders: Conditions like lupus, rheumatoid arthritis, and inflammatory bowel disease can increase the risk of developing mouth ulcers.
  • Allergic reactions: Allergies to food, medications, or other substances can trigger mouth ulcers.
  • Nutritional deficiencies: Lack of vitamins such as B12, iron, or folic acid can contribute to the development of mouth ulcers.
  • Stress and anxiety: High levels of stress and anxiety can cause mouth ulcers in some individuals.

Symptoms

  • Painful sores or lesions on the mucous membranes inside the mouth
  • Redness and swelling around the affected area
  • Pus or discharge from the ulcer
  • Fever in some cases
  • Difficulty eating, drinking, or speaking due to pain

Types of Mouth Ulcers

  • Aphthous ulcers: Also known as canker sores, these are the most common type of mouth ulcer. They are small, shallow lesions that heal on their own within a few days.
  • Herpetiform ulcers: These are small, pinpoint-sized ulcers that often occur in clusters.
  • Major aphthous ulcers: These are larger and deeper than canker sores and can take longer to heal.

Treatment and Management

  • Topical anesthetics: To relieve pain and discomfort
  • Antibacterial mouthwashes: To prevent infection
  • Corticosteroids: To reduce inflammation and swelling
  • Protective pastes or gels: To cover the ulcer and promote healing
  • Avoiding spicy, acidic, or sharp foods that can irritate the ulcer
  • Practicing good oral hygiene to prevent infection

Complications

  • Infection: Bacterial, viral, or fungal infections can develop in the ulcer.
  • Scarring: Large or deep ulcers can leave scars after healing.
  • Dental problems: Mouth ulcers can increase the risk of dental problems such as tooth decay and gum disease.

Prevention

  • Maintaining good oral hygiene
  • Avoiding spicy, acidic, or sharp foods
  • Managing stress and anxiety
  • Getting regular dental check-ups
  • Avoiding tobacco and alcohol use

Frequently Asked Questions (FAQs)

What are mouth ulcers?
Mouth ulcers are small, painful sores that appear on the inside of the mouth, lips, or throat.

What causes mouth ulcers?
Mouth ulcers can be caused by various factors, including minor injury, infection, stress, and certain medical conditions.

Are mouth ulcers contagious?
Most mouth ulcers are not contagious, but some may be caused by viral or bacterial infections that can be spread to others.

How long do mouth ulcers last?
Mouth ulcers typically heal on their own within 1-2 weeks, but can persist for longer in some cases.

Can mouth ulcers be a symptom of an underlying condition?
Yes, mouth ulcers can be a symptom of certain underlying conditions, such as inflammatory bowel disease or autoimmune disorders.

How are mouth ulcers diagnosed?
Mouth ulcers are usually diagnosed based on a physical examination and medical history, but may require further testing to rule out underlying conditions.

What are the symptoms of mouth ulcers?
Symptoms of mouth ulcers include pain, discomfort, and difficulty eating or speaking, as well as visible sores or lesions in the mouth.

Can mouth ulcers be prevented?
Some mouth ulcers can be prevented by avoiding minor injury, practicing good oral hygiene, and managing stress.

How are mouth ulcers treated?
Treatment for mouth ulcers typically involves topical pain relief, saltwater rinses, and avoidance of irritants, but may require medication or other interventions in some cases.

When should I seek medical attention for mouth ulcers?
Seek medical attention if mouth ulcers persist, worsen, or are accompanied by fever, difficulty swallowing, or other concerning symptoms.

Article last updated on: 18th October 2025.
If you have any feedback, please get in touch.

See more

 Conditions  Symptoms  Procedures

Diagnosis Pad
Medical AI Assistant with Differentials, Guidance, Transcriptions, Notes, Medical Encyclopedia and Explainable AI.
Download from App Store Download from Google Play
Available for iOS, macOS and Android.

Medical Disclaimer

The information provided is not intended to be a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of a physician or other qualified health provider with any questions you may have regarding a medical condition. Never disregard professional medical advice or delay seeking it because of something you have read on this site. We we do not guarantee, and assume no legal liability or responsibility for the accuracy, currency, or completeness of the information provided.