Can cinnamon make your tongue sore and red?

Yes, cinnamon can cause your tongue to become sore and red, especially in individuals who are sensitive or allergic to it. This reaction is often due to a compound called cinnamaldehyde, which can irritate the mucous membranes in the mouth. Additionally, cinnamon products that contain high levels of coumarin may also contribute to irritation. If you experience these symptoms, it's best to limit or avoid cinnamon and consult a healthcare professional if the discomfort persists.