For me it was easy, I went on a GF diet and my IBS cleared up in about 2 days and hasn't returned. A gluten intolerance can have almost any symptom you can imagine. There was one little kid I saw on TV that had delayed development and seizures. No GI problems at all.

My main symptoms were: IBS, thyroid disease, tendency towards autoimmune diseases

Here's a good web site for ya: http://www.celiac.com/st_main.html