Conditions · FAQ
What causes mouth sores, and are all mouth sores canker sores?
Short answer
Mouth sores have several causes, and not all are canker sores. Braces, dentures, cheek biting, infections, and treatments such as chemotherapy can cause sores. A licensed physician in your state can review your symptoms and decide whether a prescription rinse, another treatment, or an in-person exam is appropriate.
Mouth sores are painful spots or breaks in the lining of the mouth. Canker sores are one type. They usually form inside the lips or cheeks, under the tongue, or near the gums. Unlike cold sores, canker sores are not contagious and are not caused by the herpes virus.
Other sores may come from biting your cheek, a sharp tooth, poorly fitting dentures, or braces rubbing against soft tissue. Infections, certain medicines, and cancer treatments can also cause mouth sores. Sores that keep coming back may need a review for other health issues or nutrient shortages.
The right care depends on the cause. A numbing rinse may ease pain, but it does not treat every cause. Results vary. Tell your clinician when the sore started, whether it has happened before, and about any new medicines or dental work. Clear photos may help, but an in-person medical or dental exam may still be needed.
Sources
Written by the Verra clinical team · Medical review pending
General information, not medical advice. If you're in crisis, call or text 988.