Certain risk factors can increase the likelihood of developing canker sores. Here's a list, courtesy of the U.S. National Library of Medicine:
- Family history of canker sores.
- Weakened immune system.
- Dental work.
- Biting the inside of the cheek or the tongue.
- Stress, anxiety or changes in hormone levels.
- Malnutrition, particularly deficiencies in iron, folic acid or vitamin B-12.
- Allergic reaction to food.
- Viral infection.
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