The diagnoses ofIBS use to be based on exclusion and still is somewhat, but it is defined now by a certain symptoms cluster.Do You have pain or discomfort Todd?You should't self diagnose IBS though, because many other conditions can mimick SOME IBS symptoms and some of them are very serious.You might want to read this thread for more help.For new people in the process of a diagnoses.http://ibsgroup.org/eve/forums/a/tpc/f/43110261/m/430102261