Keep in mind that many aphthous ulcers are actually viral in origin, too, relating to the body's reaction to them. There are a wide variety of causes of canker

Keep in mind that many aphthous ulcers are actually viral in origin, too, relating to the body's reaction to them. There are a wide variety of causes of canker sores and mouth ulcers, which likely represent different kinds of pathologic mechanisms with the same result. Even some systemic diseases can manifest this way.