Once and for all, IS nausea a symptom of IBS or not?

It turns out that nausea is reported as a symptom by people who have been officially diagnosed with ROME I criteria. This was discovered only recently, http://www.ncbi.nlm.nih.gov:80/entrez/quer...t_uids=12492200 In the past, I posted incorrect information about this, claiming it could not be due to "IBS". What they found here is that abdominal pain was not being reported as the primary symptom, but that instead it was nonpainful discomfort. That essentially means vague and generalized sensations such as bloating and nausea.Since IBS is defined by symptoms and not by pathophysiology, it is almost certainly the case that there can either be 1) a single underlying disease process that gives rise to all the symptomsor2) differing diseases processes among IBSers. In other words, some people diagnosed with IBS don't actually have the thing we are calling IBS.Specifically, delayed gastric emptying (gastroparesis) is a more specific dieases process that almost always causes nausea and there can be others as well. Therefore, it makes sense to be thoroughly tested to see if a specific disease process can be found as the cause.