It may be that a number of contributing factors combine in just the right way to create an ultra-sensitivity in the bowel. This sensitivity makes the symptoms flare up in response to certain triggers. You may not be familiar with the term irritable bowel syndrome, but you've probably heard of colitis and spastic colon. IBS, however, is not the same as colitis, or ulcerative colitis, which is an inflammation of the lining of the colon. This is unfortunate, because IBS is quite treatable, even though it may require a multi-pronged treatment approach.
Some patients recover completely, and most find a substantial degree of relief from symptoms.
IBS is most certainly a real health problem. Depression and anxiety disorders can aggravate it, and it appears to be more common among people who were abused as children. There are medications that may help IBS, but the cornerstones of successful treatment are lifestyle changes, mainly diet and stress-reduction. A low-fat, high fiber diet is typically part of treatment. Eating small, frequent meals instead of large ones can be beneficial.