Approximately what percent of chronic diarrhea cases are due to non-GI disease?

• A. 0%
• B. Approximately 10%
• C. Approximately 50%
• D. Approximately 90%

Answer: (B)

Chronic diarrhea is overwhelmingly driven by diseases of the GI tract, but a minority of cases arise from non-GI, systemic diseases. The best estimate for how often non-GI disease is the culprit is about ten percent. This reflects that, in practice, most chronic diarrhea cases come from primary GI issues (inflammation, infection, malabsorption, dietary causes), while a smaller subset is due to systemic problems like endocrine or metabolic disorders that impact the gut.

So, when you encounter chronic diarrhea, you first pursue GI-focused explanations, but be mindful that roughly 1 in 10 cases may be due to a non-GI disease—especially if there are systemic signs or lab abnormalities that don’t fit a typical GI pattern.