How is chronic diarrhoea defined, and why is it not itself a diagnosis?

Chronic diarrhoea is the passage of three or more loose or watery stools per day for more than 4 weeks. It is not a diagnosis but a symptom that reflects underlying pathology, so management depends on a structured evaluation to identify the mechanism and cause.

Clinical relevance. Treating chronic diarrhoea as a symptom requiring a structured search for its cause avoids missing serious disease.

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Chronic diarrhoea: definition

Chronic diarrhoea is a common clinical problem that, unlike acute diarrhoea, usually reflects underlying disease requiring evaluation.

Definition

• Three or more loose or watery stools per day.
• Duration more than 4 weeks.

Why it is not a diagnosis

• It is a symptom, not a disease, and often reflects significant underlying pathology.
• The clinician's role is to identify the pathophysiological mechanism, exclude serious disease, and provide targeted therapy with supportive care.

Approach

• Classification by mechanism guides investigation and cause-specific treatment.