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Mouth ulcers are small, painful sores that can appear on the inside of the cheeks, lips, tongue, or gums. In children, they're often caused by minor injury (like accidentally biting the cheek), viral infections, or sometimes stress or a minor nutritional deficiency, and usually heal on their own within a week or two.
Evidence checked against current HSE guidance for Mouth ulcers, covering the article's core clinical information and relevant assessment, management or safety considerations.
Public health education article
Recurrent ulcers are usually not a cause for alarm — Many children get mouth ulcers from time to time without any clear pattern or underlying cause — this is common and doesn't usually need investigation unless ulcers are unusually frequent, severe, or accompanied by other symptoms.
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Mouth ulcers are small, painful sores that can appear on the inside of the cheeks, lips, tongue, or gums. In children, they're often caused by minor injury (like accidentally biting the cheek), viral infections, or sometimes stress or a minor nutritional deficiency, and usually heal on their own within a week or two.
Topic-specific prevention and risk reduction will be added during the article-specific evidence audit.
Ulcers are unusually large, numerous, or don't heal within 2-3 weeks
Mouth ulcers are small, painful sores that can appear on the inside of the cheeks, lips, tongue, or gums. In children, they're often caused by minor injury (like accidentally biting the cheek), viral infections, or sometimes stress or a minor nutritional deficiency, and usually heal on their own within a week or two.
While uncomfortable, especially when eating certain foods, mouth ulcers are rarely a sign of anything serious in an otherwise healthy, well child.
Many children get mouth ulcers from time to time without any clear pattern or underlying cause — this is common and doesn't usually need investigation unless ulcers are unusually frequent, severe, or accompanied by other symptoms.
These can irritate the ulcer and increase discomfort while it heals — softer, milder foods are more comfortable in the meantime.
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BarnMD Health Library provides general health education for public health literacy. Reading this article does not establish a doctor-patient relationship and this information is not a diagnosis, prescription, or personalised treatment plan. If you have symptoms or concerns about your health, seek appropriate advice from a qualified healthcare professional. If you develop emergency warning signs, seek urgent or emergency medical attention.
Mouth ulcers are common in children and usually heal on their own within one to two weeks.
Ulcers that are unusually large, frequent, or accompanied by fever are worth a doctor's review.