ibs4dDiarrhea-predominant IBS (IBS-D) is a subtype of irritable bowel syndrome that causes frequent bouts of diarrhea with abdominal pain and bloating. IBS-D is considered aDiarrhea-predominant IBS (IBS-D) is a subtype of irritable bowel syndrome that causes frequent bouts of diarrhea with abdominal pain and bloating. IBS-D is considered a