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Diarrhoea usually occurs when fluid can't be absorbed from the contents of your bowel, or when extra fluid is secreted into your bowel, causing watery poo.
Diarrhoea is usually a symptom of a bowel infection (gastroenteritis), which can be caused by:
Other possible causes of short-term diarrhoea include:
Diarrhoea can also sometimes be a side effect of a medication, including:
The patient information leaflet that comes with your medicine should state whether diarrhoea is a possible side effect.
Conditions that can cause persistent diarrhoea include:
Persistent diarrhoea can also sometimes occur after surgery on the stomach, such as a gastrectomy.