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Diarrhoea ( Diarrhea ) Acute in Adults : Triage

Diarrhea is typically characterized as the excessive production of stools that are looser and more watery than normal, often accompanied by an increase in the frequency of bowel movements. Normal stool output ranges from about 100 to 200 grams per day. While diarrhea is a frequent complaint among patients, it usually resolves on its own or can be effectively managed with over-the-counter remedies. However, due to the diverse causes of diarrhea, ranging from infections to dietary issues or chronic diseases, it is crucial to understand its nature and duration to manage it effectively.


Type of DiarrheaDefinitionSource
Acute DiarrheaLasting less than 14 daysBMJ Best Practice, 2023a
Persistent DiarrheaLasting more than 14 days but less than 4 weeksBMJ Best Practice, 2023a
Chronic DiarrheaLasting for more than 4 weeksArasaradnam, 2018


The duration of diarrhea is a key factor in diagnosis and management. The World Health Organization and various clinical practices define the categories of diarrhea based on how long the symptoms last.


Infection is the most common cause of acute diarrhea. Viral infections are particularly prevalent, with viruses such as norovirus, rotavirus, and adenovirus often being responsible. These viral infections typically induce symptoms that are...

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