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canker sores

canker sores (aphthous stomatitis) are painful white ulcers in the mouth that appear most often on the tongue, inside the cheeks, and inside the lips. unlike cold sores, canker sores are not contagious.

the cause of canker sores is not well-understood but may include injury or irritation inside the mouth, infection, and stress. minor canker sores heal in 1 to 3 weeks.

most people do not need to see a doctor for canker sores. the sores will get better on their own. to relieve pain, you might try over-the-counter medicine or change your diet to bland, soft foods.

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this information does not replace the advice of a doctor. healthwise, incorporated, disclaims any warranty or liability for your use of this information. your use of this information means that you agree to the terms of use and privacy policy. to learn more about healthwise, visit healthwise.org. © 1995-2022 healthwise, incorporated. healthwise, healthwise for every health decision, and the healthwise logo are trademarks of healthwise, incorporated.

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