A mouth ulcer (from Latin ulcus) is the name for the appearance of an open sore inside the mouth caused by a break in the mucous membrane or the epithelium on the lips or surrounding the mouth. The types of mouth ulcers are diverse, with a multitude of associated causes including: physical or chemical trauma, infection from microorganisms or viruses, medical conditions or medications, cancerous and sometimes nonspecific processes. Once formed, the ulcer may be maintained by inflammation and/or secondary infection.
Cold Sores
Behcet's Syndrome :: Connective Tissue

Animated-Teeth.com: Canker Sores / Aphthous Ulcers - A discussion about these disorders and their causes.
Meta Description: [ About the causes of canker sores, aphthous ulcers, and mouth ulcers. ]
Aphthous Stomatitis Web Site - Personal site devoted to Recurrent canker sores. Guide to other sites on canker sores with updates based on the most current information about causes and medications.
Canker Sores: What Are They and What Can You Do About Them? - Information from the AAFP.
Meta Description: [ Information about canker sores from the American Academy of Family Physicians. ]
Mouth Ulcers - Community for sufferers. Includes a causes survey and a treatment survey as well as an informative public message board.
Meta Description: [ Mouth Ulcers Home Page: Public message board, surveys, featured articles. The most comprehensive open access site for sufferers of mouth ulcers (canker sores, aphthous stomatitis, RAS). ]
Recurrent Aphthous Stomatitis and Perceived Stress - A research project investigating the relationship between RAS and perceived stress.
Meta Description: [ This site outlines an ongoing study into the reltionship between perceived stress and the onset of recurrent aphthous stomatitis (RAS) ]
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