<prompt> All are diagnostic criteria for irritable bowel syndrome except:Pain improves with defectionNocturnal episodes of colicky painOnset associated with change in frequency of stoolOnset associated with change in appearance form of stool  <response>: The diagnostic criteria for irritable bowel syndrome is - Recurrent abdominal pain or discomfo for at least 3 days per month associated with 2 or more of the following features - Pain improvement with defecation Onset with change in form appearance of stool Onset with change in frequency of stool Nocturnal diarrhea or pain is not a feature of irritable bowel syndrome and is seen with Diabetic neuropathy. Bleeding is also not a feature. ROME CRITERIA FOR DIAGNOSIS OF IBS 