Learn what causes mouth ulcers, how to prevent them, and when to seek medical help. Understand triggers like stress, injuries, diet, and health conditions. Read this article to learn about mouth ulcer symptoms, causes, and treatment. Don't delay a proper diagnosis, or you could be causing more harm than good. A mouth ulcer is a sore or lesion on the inside of your mouth. They typically go away on their own, but chronic cases require treatment. Causes of Mouth Ulcers While the exact cause of mouth ulcers is still not yet known and may vary from person-to-person, the most common cause of mouth ulcers world over is accidentally biting your inner cheek. This causes injury and trauma to the mucous membrane. Some common causes or other factors that may aggravate mouth ulcers are as follows:
