Several causes: People with mouth ulcers can be in pain especially when eating salty or spicy foods. These ulcers can be isolated occurrences that come and go. Sometimes they are due to braces or biting ones cheek. They could be due to a viral infection (coxsackie, herpes etc), from nutritional deficiencies, or be related to chronic illnesses such as crohn's disease. If you have them, see your doctor for advice.
Answered 9/28/2016
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