Add Yahoo as a preferred source to see more of our stories on Google. What starts as a subtle tingle or burning in your mouth can signal something more painful on the horizon: a pesky canker sore. For ...

Roll your tongue around your mouth, and you might feel a sting from a new tender spot. A tiny, unwelcome crater of pain, a red circle of fire tucked against your cheek. It feels worse with every ...

Three times in the past year, I got a canker sore while traveling. The pattern makes it easy to diagnose: The cuisines of the countries I had traveled to were heavy in tomato sauce, cheese, yogurt, ...