A functional bowel disorder (FBD) is a functional gastrointestinal disorder with symptoms attributable to the mid or lower gastrointestinal tract, including the irritable bowel syndrome (IBS), functional abdominal bloating, functional constipation, functional diarrhea, and unspecified functional bowel disorder.

• Diet plus lifestyle changes
• Over-the-counter or prescription medication
• Physical therapy and/or biofeedback training

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