How does the incidence of inflammatory bowel disease (IBD) vary by age?

Updated: Apr 10, 2020
  • Author: William A Rowe, MD; Chief Editor: BS Anand, MD  more...
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The age distribution of newly diagnosed IBD cases is bell-shaped; the peak incidence occurs in people in the early part of the second decade of life, with the vast majority of new diagnoses made in people aged 15-40 years. A second, smaller peak in incidence occurs in patients aged 55-65 years and is increasing. Approximately 10% of IBD patients are younger than 18 years.

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