Canker sores, also known as aphthous ulcers, are small, shallow lesions that develop on the soft tissues inside your mouth or at the base of your gums. Unlike cold sores, canker sores don’t occur on the surface of your lips and aren’t contagious. They can be quite painful, making eating and talking uncomfortable.

The exact cause of canker sores is unknown, but they may be triggered by stress, minor injury to the inside of the mouth, acidic or spicy foods, or underlying health conditions. Symptoms include a painful sore or sores inside your mouth, a tingling or burning sensation prior to the appearance of the sores, and round, white or gray sores with a red edge.

The Science Behind Canker Sores: Why They Hurt

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