There is no unequivocal evidence that IBS is an underlying condition contributing to the future occurrence of IBD.
No. Although both diseases can present with abdominal pain and diarrhea. IBS is a functional disorder and not associated with anatomical abnormalities of the intestines, while, IBD is characterized by inflammation, ulcerations, and structural involvement of the bowel. There is no unequivocal evidence that IBS is an underlying condition contributing to the future occurrence of IBD.