Many people with Crohn's disease begin to develop ulcers in their mouths, stomachs, and intestines. In the mouth, these small, painful lesions usually appear along the base of the gums and can make chewing and swallowing difficult. There are several reasons for this symptom, including vitamin deficiencies, medication side effects, and inflammation. The stomach or peptic ulcers develop when stomach acid begins to damage the protective lining of the stomach and gastrointestinal tract.
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