Inflammatory Bowel Disease on Rise in US

The new estimate is based on a national survey conducted by researchers at the Centers for Disease Control and Prevention (CDC). Survey respondents were asked whether a doctor or other health professional had ever told them that they had either Crohn's disease or ulcerative colitis, which are the two types of inflammatory bowel disease (IBD). Based on the responses, the researchers estimated that 1.3 percent of U.S. adults, or 3.1 million Americans, have IBD.