Q: Can canker sores be caused by an allergy?
A: Yes. However, identifying the particular allergen can be challenging. This is an area where the individual patient can contribute to his or her care. Strategies for identifying potential allergens include observing any relationship between the intake of a particular food or beverages and development of canker sores. Many individuals are intolerant of wheat products (gluten), nuts, tomatoes, and various fruits. Two frequent food additives that are associated with canker sores are the spice cinnamon and benzoic acid (a common preservative found in foods and soft drinks). A trial elimination of a suspected food substance or additive is a sound approach to identifying potential allergens.