IBS is a clinical entity defined by a specific set of criteria, the ROME II criteria. No one should be diagnosed with IBS unless they meet this criteria. Now doctors are finding that there are some who really have pelvic floor dysfunction (e.g, incomplete evacutation) and constipation (defined by transit time study and considered separate from IBS), but beyond that, I don't think anyone in IBS field believes that there is any substantial number of people who have been diagnosed with IBS who really have some hitherto undescribed novel condition. IBSers really do have much the same complaints.quoterobably not the same one, and it's not IBS. Look at how many of us have a variety of other health problems! IBS is simply a wastebasket diagnosis after they've ruled out everything else they know about.