Many people have occasional signs and symptoms of irritable bowel syndrome. However, you're more likely to have IBS if you:

  • Are young. IBS symptoms first appear before the age of 35 for about half of those with the disorder.
  • Are female. More women than men are diagnosed with this condition.
  • Have a family history of IBS. Studies have shown that people who have a first-degree relative — such as a parent or sibling — with IBS are at increased risk of the condition. It's not clear whether the influence of family history on IBS risk is related to genes, to shared factors in a family's environment, or both.
Jul. 29, 2011