Health & Science

Canker Sores and the Digestive Tract

They are small and painful, and can turn your favorite lemon sorbet into a world of hurt. They are canker sores, and if you are one of the 20 percent of people who get them, you know that these noncontagious mouth ulcers can make eating, drinking and even talking a feat.

A number of things tend to trigger them, from trauma to the mouth (think of an accidental bite to the cheek or a toothbrush jab) to a diet lacking in certain vitamins and minerals. But surprisingly, we don’t really know why they develop.