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Canker sores are thought to be caused by: 1  Injuries to the mouth, as seen frequently by contact sports players. 2  Temperature hot food or drink may cause a canker sore in the area of the mouth that was essentially burnt by the offending substance.
Several conditions can cause a burning sensation in the mouth. Some nutritional deficiencies â particularly of B vitamins, iron and zinc â can cause it. These problems can be detected by simple blood tests. Medicines that cause the mouth to become dry (due to decreased saliva production) can result in mouth irritation.