Causes Canker sores are a common form of mouth ulcer. They occur in women more often than men. They may occur at any age, but usually first appear between the ages of 10 and 40. Canker sores usuall

Most canker sores are round or oval with a white or yellow center and a red border. They form inside your mouth — on or under your tongue (soft palate), inside your cheeks or lips, and at the base o

What Causes Canker Sores? The exact cause of most canker sores is unknown. Stress or tissue injury is thought to be the cause of simple canker sores. Certain foods – including citrus or acidic frui