What Causes a Canker Sore?

Wondering what triggers a canker sore?

Unfortunately, causes and triggers aren’t always well defined. If you know the most common triggers, it can help you to avoid the next occurrence.

  • Fatigue
  • Emotional stress
  • Trauma or injury to the mouth (including biting the inside of your cheek or tongue)
  • Hormonal factors
  • Food or drug hypersensitivity
Data on file.