Crohn's disease, an inflammatory bowel disease, can strike at any age but most often is diagnosed in young people ages 15 to 30, according to Mayo Clinic experts. Symptoms range from mild to severe and can include diarrhea, abdominal pain, blood in the stool, ulcers, fatigue and reduced appetite. Research indicates that Crohn's disease, which has no cure, most likely has a hereditary component.

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