All cause diarrhea except;
Correct Answer: Hypercalcemia
Description: Hypercalcemia increases the tone of sphincters of the gut leading to refractory constipation. Autonomic dysfunction in diabetes explains the diarrhea. Due to sympathetic activity increase in thyrotoxicosis there is a reduction in small bowel transit time explaining the diarrhea. IBS has variable presentation between diarrhea and constipation
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