Tags: Disease.
Irritable bowel syndrome (IBS or spastic colon) is a symptom-based diagnosis characterized by chronic abdominal pain discomfort bloating and alteration of bowel habits. As a functional gastrointestinal disorder (FGID) IBS has no known organic cause. Diarrhea or constipation may predominate or they may alternate (classified as IBS-D IBS-C or IBS-A respectively).