Ulcus (Mouth Sores) - Causes, Treatment & When to See a Doctor

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What is Ulcus (Mouth Sores)?

Ulcus, commonly called a mouth sore, is a painful, shallow lesion that develops on the soft tissues inside the mouth—most often on the inner cheeks, tongue, gums, or the floor of the mouth. These ulcers are usually round or oval, have a white or yellowish center surrounded by a red halo, and may range from a few millimeters to several centimeters in size. While most mouth sores are harmless and resolve on their own within 1–2 weeks, they can sometimes signal an underlying medical condition or infection that requires attention.

Common Causes

Below are the most frequent reasons why an ulcer appears in the oral cavity.

• Aphthous stomatitis (canker sores) – small, recurring ulcers of unknown exact cause, often triggered by stress or minor oral trauma.
• Trauma – accidental bites, sharp edges of dental appliances, aggressive brushing, or ill‑fitting dentures.
• Viral infections – herpes simplex virus (cold sores), coxsackievirus (hand‑foot‑mouth disease), or varicella‑zoster.
• Bacterial infections – Treponema pallidum (syphilis) or Mycobacterium species (tuberculosis oral lesions).
• Fungal infection – oral thrush caused by Candida albicans.
• Autoimmune diseases – Behçet’s disease, lupus, or pemphigus vulgaris may produce persistent ulcers.
• Nutritional deficiencies – low iron, folate, vitamin B‑12, or vitamin C.
• Medication side effects – chemotherapy, non‑steroidal anti‑inflammatory drugs (NSAIDs), or some antihypertensives.
• Allergic reactions – contact allergy to toothpaste, mouthwash, or certain foods.
• Systemic illnesses – inflammatory bowel disease (Crohn’s disease, ulcerative colitis), HIV/AIDS, or diabetes mellitus.

Associated Symptoms

Mouth ulcers rarely occur in isolation. The following signs often accompany them, helping clinicians narrow down the cause.

• Burning or tingling sensation before the sore appears.
• Difficulty eating, drinking, or speaking due to pain.
• Fever, chills, or malaise (more common with viral or bacterial infection).
• Swollen lymph nodes in the neck or under the jaw.
• Multiple sores that appear simultaneously (suggests aphthous stomatitis or systemic disease).
• White curd‑like coating on the tongue or palate (indicative of candidiasis).
• Skin lesions elsewhere on the body (e.g., erythema nodosum in Behçet’s disease).
• Joint pain or gastrointestinal symptoms (pointing toward inflammatory bowel disease).

When to See a Doctor

Most mouth sores improve without medical care, but you should schedule an appointment if any of the following occur:

• The ulcer lasts longer than 3 weeks.
• Severe pain that interferes with nutrition or hydration.
• Repeated episodes (more than 3–4 times a year) without a clear trigger.
• Ulcers are larger than 1 cm, have an irregular border, or are accompanied by a lump.
• Unexplained weight loss, persistent fever, night sweats, or swollen lymph nodes.
• Signs of infection such as pus, increasing redness, or a foul odor.
• History of cancer, immunosuppression, or recent chemotherapy/radiation therapy.

Diagnosis

Healthcare providers use a combination of history taking, visual examination, and, when needed, laboratory or imaging studies.

Step‑by‑step evaluation

1. Medical history – questions about diet, stress, medication use, recent illnesses, and systemic diseases.
2. Oral examination – inspection with a tongue depressor and light source; measurement of size, number, and location of ulcers.
3. Swab or biopsy – if the lesion looks suspicious (irregular border, persistent beyond 3 weeks) a tissue sample may be sent for pathology.
4. Blood tests – CBC, iron studies, vitamin B‑12, folate levels, HIV screening, or autoimmune panels when indicated.
5. Viral cultures or PCR – for suspected herpes simplex or Coxsackie virus.
6. Imaging – rarely needed, but a panoramic X‑ray or CT scan can rule out underlying bone infection (osteomyelitis) or malignancy.

Treatment Options

Management is tailored to the underlying cause and severity of symptoms.

Self‑care and home remedies

• Salt‑water rinse – dissolve ½ tsp of salt in 8 oz warm water; rinse 3‑4 times daily to reduce inflammation.
• Topical anesthetics – over‑the‑counter benzocaine or lidocaine gels provide temporary pain relief.
• Honey – raw or medical‑grade honey has antimicrobial properties and can be applied gently to the ulcer.
• Avoid irritants – steer clear of spicy, acidic, or crunchy foods; use a soft‑bristled toothbrush.
• Hydration – sip water or non‑citrus electrolyte drinks to keep the mouth moist.

Pharmacologic therapies

• Topical corticosteroids – clobetasol or fluocinonide paste applied 2–3 times daily for painful aphthous ulcers (prescription required).
• Systemic corticosteroids – short courses of prednisone for severe or extensive ulcers, especially when linked to autoimmune disease.
• Antiviral medication – acyclovir, valacyclovir, or famciclovir for herpes simplex‑related lesions.
• Antifungal agents – nystatin suspension or fluconazole for candidal ulcers.
• Antibiotics – amoxicillin‑clavulanate or clindamycin if a bacterial infection is confirmed.
• Immunomodulators – colchicine, thalidomide, or biologics (e.g., infliximab) for refractory aphthous ulcers associated with Behçet’s disease.
• Vitamin supplementation – oral iron, folic acid, vitamin B‑12, or vitamin C when labs show deficiency.

Procedural options

• Laser therapy – low‑level laser can accelerate healing and reduce pain.
• Electrocoagulation – cauterizes larger ulcers that bleed or recur frequently.
• Excisional biopsy – performed when malignancy cannot be ruled out.

Prevention Tips

While not all mouth sores can be avoided, the following strategies lower the likelihood of recurrence.

• Maintain excellent oral hygiene but use a soft‐bristled brush and non‑alcoholic toothpaste.
• Identify and eliminate trigger foods (citrus, nuts, very hot beverages).
• Manage stress through relaxation techniques, regular exercise, or counseling.
• Stay well‑nutrient‑replete: eat a balanced diet rich in leafy greens, lean protein, and whole grains.
• Quit smoking and limit alcohol intake, both of which irritate oral mucosa.
• Regular dental check‑ups (at least twice a year) to adjust ill‑fitting prostheses.
• For those with chronic conditions (e.g., IBD), adhere to prescribed disease‑modifying therapy.
• Use protective mouth guards during contact sports to prevent traumatic ulcers.

Emergency Warning Signs

References

• Mayo Clinic. “Canker sores.” https://www.mayoclinic.org
• Cleveland Clinic. “Oral Ulcers: Causes, Diagnosis, and Treatment.” https://my.clevelandclinic.org
• National Institutes of Health (NIH). “Aphthous Stomatitis.” https://www.ncbi.nlm.nih.gov
• World Health Organization. “Oral health.” https://www.who.int
• Centers for Disease Control and Prevention. “Herpes Simplex Virus.” https://www.cdc.gov
• Journal of Oral Pathology & Medicine. “Management of oral ulcerations.” 2022; 51(4): 317‑328.

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