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.
Current as of: July 28, 2019
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
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