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Canker sore

Canker sore on the inside of the lip

A canker sore is a painful white ulcer in the mouth. They appear most often on the tongue, inside of the cheeks, and inside of the lips. Unlike cold sores, canker sores are not contagious. But in some people they keep coming back. Canker sores cause pain that may make it difficult to eat or drink.

ByHealthwise Staff
Primary Medical Reviewer Kathleen Romito, MD - Family Medicine
Martin J. Gabica, MD - Family Medicine
Adam Husney, MD - Family Medicine
Specialist Medical Reviewer Arden Christen, DDS, MSD, MA, FACD - Dentistry

Current as ofMay 7, 2017

Current as of: May 7, 2017

Author: Healthwise Staff

Medical Review: Kathleen Romito, MD - Family Medicine & Martin J. Gabica, MD - Family Medicine & Adam Husney, MD - Family Medicine & Arden Christen, DDS, MSD, MA, FACD - Dentistry