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Risk factors
By Mayo Clinic staffAnyone can develop canker sores, but these factors make you more susceptible:
- Your sex. Canker sores, especially clusters of small lesions, are more common in women than in men.
- Age. Most people experience their first outbreak when they're between 10 and 40 years of age. The sores tend to occur less frequently as you get older.
- Family history. As many as 50 percent of people with canker sores have a close family member with the disorder. This may be due to heredity or to a shared factor in the environment, such as certain food or allergens.
