Could your IBS be SIBO? Could your IBS be SIBO?Could your IBS be SIBO? Small Intestinal Bacterial Overgrowth (SIBO) is one of the leading causes of Irritable Bowel Syndrome (IBS) and painful bloating.Take the quiz to find out if you might have it. *Disclaimer Startpress Enter 1. Do you experience frequent, extreme bloating? YES NO If you are human, leave this field blank. ContinueSubmit Use Shift+Tab to go back