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What causes mouth ulcers? 25 possible conditions

See a list of possible causes in order from the most common to the least.



Leishmaniasis is a parasitic disease caused by the Leishmania parasite found in sand flies.

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Gonnorhea is a sexually transmitted disease that affects warm, moist areas of the body. Early symptoms include pain when urinating and discharge.

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Temporal Arteritis

Temporal arteritis is a condition in which the temporal arteries, which supply blood to the head and scalp, become inflamed or damaged. Scalp sensitivity or tenderness is a symptom.

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Celiac Disease (Gluten Intolerance)

Celiac disease is a digestive disorder caused by an immune reaction to gluten. Symptoms vary but can include arthritis, fatigue, and abdominal symptoms.

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Secondary Syphilis

Secondary syphilis is the second stage of this highly contagious sexually transmitted infection. Learn about the symptoms and treatments for secondary syphilis.

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.