A canker sore is a little ulcer in the protective lining of your mouth. Unlike cold sores, which are caused by the herpes virus, canker sores are not the result of viral or bacterial infections and are not contagious. They’re auto-immune, which means that your body is basically attacking itself.
What foods cause canker sores?
Stress or tissue injury is thought to be the cause of simple canker sores. Certain foods — including citrus or acidic fruits and vegetables (such as lemons, oranges, pineapples, apples, figs, tomatoes, and strawberries) — can trigger a canker sore or make the problem worse.
What is the cause of aphthous stomatitis?
The exact cause of this disease is not known. However, there are many factors that are thought to be involved with the development of canker sores, including: Weakened immune system. Allergies to food such as coffee, chocolate, cheese, nuts, and citrus fruits.