Canker Sores

Canker sores are small, painful ulcers that develop inside the mouth, often on the inner cheeks, lips, tongue, or gums. Unlike cold sores, they are not contagious, but they can make everyday activities like eating, drinking, and speaking uncomfortable. Canker sores usually appear as round or oval lesions with a white or yellow center and a red, inflamed border.

The exact cause of canker sores isn’t always clear, but common triggers include minor mouth injuries, stress, hormonal changes, acidic or spicy foods, and nutritional deficiencies such as low iron or vitamin B12. In some cases, they may be linked to immune responses or underlying health conditions.

Most canker sores heal on their own within one to two weeks. Pain can often be managed with topical treatments, saltwater rinses, and avoiding foods that irritate the area. However, frequent, unusually large, or long-lasting sores may need medical or dental evaluation to rule out infections or other conditions. This section explores what causes canker sores, how to relieve discomfort, and when persistent symptoms should be checked by a healthcare professional.