DIARRHEA is a topic covered in the Harrison's Manual of Medicine.

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Harrison’s Manual of Medicine

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Formally defined as fecal output >200 g/d on low-fiber (western) diet; also frequently used to connote loose or watery stools. Considered acute if <2 weeks duration, persistent if 2−4 weeks, and chronic if >4 weeks. Mediated by one or more of the following mechanisms:

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