The following is an extract
THE MIND-BODY CONNECTION: THE "IRRITABLE BODY" AND SOMATIZATION
Just as the GI tract is unusually sensitive and irritable, many people with irritable bowel syndrome and other functional GI disorders seem to have a sensitive "irritable body", or what doctors call "somatization".
As in IBS and other functional GI disorders, these symptoms are associated with normal test results and cannot be explained by any specific disease process. Disturbances in the Mind-Body/Brain-Gut Connection account for much of the trouble.