Canker Sores- What Are the Causes?

What exactly causes canker sores isn’t known yet. But, it’s a well-known fact that they are more common in females and can occur at any age- usually between the ages of 10 and 40 years.

It is believed that some bacteria or viruses are the culprits behind the occurrence of canker sores. Here are some of the other factors associated with the development of canker sores:


  • Injuries to the mouth during contact sports.
  • Accidental trauma to the lips or cheeks.
  • Due to burn caused by hot food or drink.
  • Intake of spicy or acidic food.
  • Allergic reaction to some food items.
  • Due to deficiencies of vitamin B12, folic acid, or iron.
  • Hormonal changes during menstruation, pregnancy or menopause.
  • Familial tendency.
  • Ill fitting dentures.
  • Broken and sharp tooth surfaces cause sores by rubbing against tissues inside the mouth.
  • Orthodontic attachments can cause canker sores when there is friction with structures inside the mouth.
  • Allergies to metals present in orthodontic devices.
  • Canker sores are thought to be associated with inflammatory bowel diseases like Ulcerative colitis and Crohn’s disease.
  • Commonly seen in patients who are immuno-suppressed like AIDS.
  • Due to some ingredients present in the tooth paste like sodium lauryl sulphate.
  • Situations of emotional stress.
  • Tobacco chewing.


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