Irritable Bowel Syndrome Irritable Bowel Syndrome IBS IBS IBS IBS IBS IBS (Irritable Bowel Syndrome) irritable bowel syndrome Learn more about Irritable Bowel Syndrome from the NIDDK. Irritable Bowel Syndrome Irritable bowel syndrome IBS IBS Irritable Bowel Syndrome IBS IBS IBS Irritable Bowel Syndrome irritable bowel syndrome IBS irritable bowel syndrome IBS Learn more about IBS » irritable bowel syndrome Health information about Irritable Bowel Syndrome digestive.niddk.nih.gov