What is a canker sore and what causes them?
Canker sores are round, shallow recurring ulcers on the cheeks, lips, tongue or the base of the gums that affect approximately 17% of the population. They can be associated with diseases such as lupus and are usually inherited.
The cause of canker sores is not known, but most theories involve an immune abnormality. Canker sores are often confused with cold sores, which are caused by a virus.
These ulcers may begin with a burning or tingling sensation in an area of inflammation and take two to three days to form completely. Despite the discomfort, they are not a significant risk to your health. However, if your have severe, recurring cankers sores, or they become worse, consult your dentist or physician in case there are some other underlying health conditions.