Which condition is an extra-GI kidney cause of chronic diarrhea?

• A. Nephrolithiasis
• B. Uremia
• C. Acute kidney injury
• D. Chronic kidney disease

Answer: (B)

Chronic diarrhea can arise from a non-GI systemic problem when toxins build up in the body from kidney failure. In advanced kidney disease, uremic toxins accumulate and irritate the intestinal lining, accelerate gut motility, and disrupt mucosal function, producing persistent, watery diarrhea. This is a hallmark of the uremic state, which also brings symptoms like nausea and anorexia, reflecting its systemic origin rather than a primary bowel disease.

Nephrolithiasis (kidney stones) typically causes flank pain and blood in the urine, not a chronic diarrheal pattern. Acute kidney injury is a sudden, temporary loss of kidney function and doesn’t usually present with a long-standing diarrhea syndrome. Chronic kidney disease can progress to uremia, which then presents with diarrhea among other systemic symptoms, but the direct cause of the chronic diarrhea in this context is the uremic toxin buildup.