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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 often cause pain and discomfort, and may alter the person's choice of food while healing occurs (e.g. avoiding acidic or spicy foods and beverages). They may form individually or multiple ulcers may appear at the same time (a crop of ulcers). Once formed, the ulcer may be maintained by inflammation and/or secondary infection. Rarely, a mouth ulcer that does not heal may be a sign of oral cancer.