I have never failed to correct a case of irritable bowel syndrome if the patient has been persistant and stuck with my care the causes of IBS are:
1) Spinal misalignment
2) Diet
3) Allergies, dairy and wheat are the most common.
4) Candida overgrowth
5) Parasites
6) General toxicity
7) Acidosis
8) Emotions
It may take time to reverse the inflammatory process so persist with care.