Understanding Canker Sores - the Basics

What Are Canker Sores?

Canker sores, also known as aphthous ulcers, are annoying irritations in the mouth that afflict many Americans each year. They are different from cold sores, which usually appear on the outside of the mouth on the lips. Canker sores appear most commonly in adolescents and in women just before the onset of their menstrual period. In fact, women are twice as likely as men to get them. If your parents suffered from canker sores, you have a greater chance of developing them. Often, canker sores occur when you are under stress or run down.

Traumatic ulcers, which are caused by injuries, result in similar sores. These injuries are often caused by rough dentures, a slip of the toothbrush or hot food.

What Causes Canker Sores?

No one knows what causes most canker sores, or why women are more likely to get them. Their appearance, however, often seems related to stress. Unlike cold sores, canker sores are not thought to be contagious. They don't pose any health risk other than the discomfort that comes along with them.