How can you conclusively say that this is psychological just because you ran a handful of tests that came back negative? I think it's a pretty irresponsible thing to say to a group of sufferers who come here because no one else in our daily lives understands our disease. Plenty of diseases present only the symptom of disease and not any underlying cause. In fact many auto-immune diseases are like this. Is Rheumatoid Arthritis also a psychological issue? Is Psoriasis purely psychological? Is MS purely psychological? What kind of researcher would come to this conclusion just because you can't find the cause? By the way, all of the above mentioned diseases can present spontaneous remission.