health

Canker sores are most common in children over ten years of age and
young adults. They are estimated to occur in 30–60 percent of the general
population. They appear to be equally common in all races and
ethnic groups but are slightly more common in women of childbearing
age than in men. Herpetiform sores are more common in older people
than in younger patients.
Canker sores appear to run in families even though they are not contagious;
about 50 percent of people who have frequent occurrences of
canker sores have relatives with the same problem. People with certain
digestive disorders, including Crohn disease, irritable bowel syndrome,
and celiac disease, are also at increased risk of recurrent canker sores.