Can irritable bowel syndrome cause weight loss?

IBS: IBS generally does not cause weight loss and this is one of the clues we use to distinguish it from inflammatory bowel disease, celiac disease, malignancy, other diarrhea casesetc. Obviously if a patient with IBS purposely withholds calories in an effort to control symptoms, weight loss will occur. If you have otherwise unintended weight loss you should be evaluated by your physician for diagnosis