5 doctors weighed in:

What are aphthous ulcers?

5 doctors weighed in
Marianne DiNapoli
Obstetrics & Gynecology
4 doctors agree

In brief: Canker sore.

An aphthous ulcer is also known as a canker sore, often a painful circular lesion inside the mouth.
It does not have one specific cause, but it can be brought on by many triggers such as stress, infection, vitamin deficiencies, or immune system abnormalities. Other than being painful, they are harmless and can be treated with topical oral agents.

In brief: Canker sore.

An aphthous ulcer is also known as a canker sore, often a painful circular lesion inside the mouth.
It does not have one specific cause, but it can be brought on by many triggers such as stress, infection, vitamin deficiencies, or immune system abnormalities. Other than being painful, they are harmless and can be treated with topical oral agents.
Marianne DiNapoli
Marianne DiNapoli
Answer assisted by Marianne Di Napoli, Medical Student
Thank
Read more answers from doctors