In what age group is the onset of irritable bowel syndrome (IBS) symptoms most common?

Updated: Dec 11, 2019
  • Author: Jenifer K Lehrer, MD; Chief Editor: BS Anand, MD  more...
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Patients often retrospectively note the onset of abdominal pain and altered bowel habit in childhood. Approximately 50% of people with irritable bowel syndrome report symptoms beginning before age 35 years. The development of symptoms in people older than 40 years does not exclude irritable bowel syndrome but should prompt a closer search for an underlying organic etiology.

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