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Mouth ulcers are tiny breaks in the lining of the mouth or on the tongue that form painful flat sores. Theyâre thought to be caused by a virus. They mainly occur when your child has been ill or tired, as well as during stressful times. These types of ulcers are often referred to as âaphthous ulcersâ or âcanker soresâ.
Mouth ulcers may occasionally reflect other health problems such as inflammatory bowel disease or an allergy to gluten (found in wheat, rye, barley and oats), fluoride or some other substance. Mouth ulcers may also indicate an iron deficiency. This can be ascertained with a blood test.