Who gets IBS?
Up to one in five Americans has IBS. IBS often begins before the age of 35, but it can start at any age. IBS seems to run in families–people with IBS often report having a family member with IBS. Most people diagnosed with IBS (up to 75 percent) are women. But, it is not known for sure that IBS affects more women than men. It may be that women are more likely to talk to their doctors about their symptoms.