Mouth Ulcers: Causes, Symptoms, and Treatment

What is Mouth Ulcers?

Mouth ulcers, also known as canker sores or aphthous ulcers, are small, painful lesions that develop in the mouth or at the base of the gums. They can make eating, drinking, and talking uncomfortable. Unlike cold sores, mouth ulcers are not contagious and typically heal within one to two weeks without treatment.

These ulcers appear as round or oval sores with a white or yellow center and a red border. They can occur singly or in clusters and may vary in size. While most mouth ulcers are harmless, persistent or unusually large ulcers may require medical attention.

Common Causes

Mouth ulcers can develop due to various factors, including:

• Minor mouth injury – From dental work, aggressive brushing, or accidental bites.
• Stress or anxiety – Emotional stress can trigger or worsen mouth ulcers.
• Hormonal changes – Some women experience ulcers during menstruation or pregnancy.
• Food sensitivities – Spicy, acidic, or citrus foods may irritate the mouth lining.
• Nutritional deficiencies – Lack of vitamin B12, iron, or folate can contribute.
• Infections – Viral (like herpes simplex) or bacterial infections may cause ulcers.
• Autoimmune disorders – Conditions like lupus or Behçet’s disease can lead to recurrent ulcers.
• Medications – Certain drugs (e.g., NSAIDs, beta-blockers) may trigger ulcers as a side effect.
• Underlying health conditions – Such as celiac disease, Crohn’s disease, or HIV/AIDS.
• Toothpaste or mouthwash ingredients – Sodium lauryl sulfate (SLS) may irritate some individuals.

Sources: Mayo Clinic, NHS

Associated Symptoms

Mouth ulcers may be accompanied by:

• A tingling or burning sensation before the ulcer appears.
• Pain or discomfort, especially when eating, drinking, or brushing teeth.
• Swollen lymph nodes (in severe cases).
• Fever or general malaise (if caused by an infection).
• Difficulty speaking or swallowing (with large or multiple ulcers).

If ulcers persist beyond two weeks or worsen, consult a healthcare provider.

When to See a Doctor

While most mouth ulcers heal on their own, seek medical advice if you experience:

• Ulcers larger than 1 cm in diameter.
• Ulcers that last longer than two weeks.
• Frequent recurrence (more than 2-3 times a year).
• Severe pain that interferes with eating or drinking.
• Signs of infection (pus, spreading redness, fever).
• Ulcers accompanied by joint pain, rash, or other systemic symptoms.

A doctor can rule out underlying conditions like infections, autoimmune disorders, or nutritional deficiencies.

Diagnosis

Diagnosing mouth ulcers typically involves:

• Medical history review – Including frequency, duration, and triggers.
• Physical examination – Checking the size, location, and appearance of ulcers.
• Blood tests – To check for deficiencies (e.g., B12, iron) or infections.
• Biopsy – Rarely needed, but may be done for persistent or unusual ulcers.
• Allergy testing – If food or medication sensitivities are suspected.

Source: Cleveland Clinic

Treatment Options

Medical Treatments

• Topical gels or creams – Such as benzocaine or lidocaine for pain relief.
• Antimicrobial mouthwashes – To reduce infection risk (e.g., chlorhexidine).
• Corticosteroid ointments – For severe or recurrent ulcers (e.g., triamcinolone).
• Oral medications – Such as sucralfate (for coating ulcers) or colchicine (for Behçet’s disease).

Home Remedies

• Rinse with saltwater or baking soda solution (1 tsp in ½ cup warm water).
• Apply a small amount of honey or coconut oil to the ulcer for soothing effects.
• Avoid spicy, acidic, or crunchy foods that may irritate the ulcer.
• Use a soft-bristled toothbrush and SLS-free toothpaste.
• Stay hydrated and maintain good oral hygiene.

Source: Healthline

Prevention Tips

To reduce the risk of mouth ulcers:

• Avoid foods that trigger ulcers (e.g., citrus, spicy foods).
• Manage stress through relaxation techniques (e.g., meditation, exercise).
• Maintain a balanced diet rich in vitamins and minerals.
• Use a soft toothbrush and avoid aggressive brushing.
• Visit a dentist regularly to address sharp teeth or ill-fitting dental appliances.

Emergency Warning Signs

Seek immediate medical attention if you experience:

• Ulcers that bleed excessively or do not heal.
• Difficulty breathing or swallowing (signs of a severe allergic reaction).
• High fever or signs of systemic infection (e.g., swollen glands, fatigue).
• Ulcers spreading rapidly or accompanied by severe pain.

These symptoms may indicate a serious condition requiring urgent care.