As a result the sensitive tissue underneath is exposed to the contents of the mouth. Imagine if you were to rub the skin off of your arm and then apply salt water to the affected area. This is basically what is happening inside your mouth with your canker sores. Canker sores, however, are not caused by a virus or germ. The reason canker sores may be seen at the same time is that stress seems to be a factor in initiating canker sores.
Stress also weakens the immune system making a person more likely to become sick as well.
Unfortunately, I can no longer enjoy chocolate. It seems that after eating chocolate I come down with canker sores. These people seem to get canker sores as a result of an allergic reaction to certain foods. Foods commonly associated with this allergic reaction include nuts, peanut butter, seafood, wheat products, chocolate, and milk. In several British studies, a deficiency in the level of vitamins and minerals was seen in a significant number of RAS sufferers.