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Canker sores may also occur because of certain conditions and diseases, such as: 1  Celiac disease, a serious intestinal disorder caused by a sensitivity to gluten, a protein found in most grains. 2  Inflammatory bowel diseases, such as Crohn's disease and ulcerative colitis.
Common symptoms of canker sores include the following: A burning, tingling, or prickling sensation, up to 24 hours before the sore appears Crater-like ulcers that are white, gray, or yellow in color, with a red border