Irritable bowel syndrome (IBS), a functional disorder of the lower gastrointestinal tract, affects between 19 and 34 million Americans. The primary symptoms of IBS include abdominal pain and/or tenderness and altered bowel function. Other commonly reported symptoms include gas, bloating, and nausea. While the etiology of IBS is relatively unknown, both medical and psychological literatures point to the role of psychosocial factors in the onset and maintenance of the syndrome.
This chapter has three parts. First, it discusses the refining of the criteria necessary to diagnose the syndrome and describes the epidemiology of IBS. Further, it reviews the literature regarding the role of psychological distress, stress, life events, and early sexual abuse in the onset and maintenance of the disorder.
In the second part of the chapter, we review psychosocial and treatment literature relevant to recurrent abdominal pain (RAP), a functional GI disorder diagnosed in childhood. Finally, in part three of the chapter, we offer empirical evidence supporting the role of psychological intervention in alleviating symptoms of IBS, and specifically discuss the treatment outcome studies we have conducted over the past decade.
Lastly, we offer some conclusions and future directions for research and treatment of irritable bowel syndrome.