At what age does the onset of Crohn disease typically occur?

Updated: Jul 26, 2019
  • Author: Leyla J Ghazi, MD; Chief Editor: Praveen K Roy, MD, AGAF  more...
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The age of onset of Crohn disease has a bimodal distribution. The first peak occurs between the ages of 15 and 30 years (late adolescence and early adulthood), and the second occurs mainly in women between the ages of 60 and 70 years. However, most cases begin before age 30 years, and approximately 20-30% of all patients with Crohn disease are diagnosed before age 20 years. A greater proportion of colonic and distal Crohn disease has been diagnosed in older patients, whereas younger patients have predominantly ileal disease. [1]

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