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Diarrhoea

Read about causes of diarrhoes. Diarrhoea usually occurs when fluid can't be absorbed from the contents of your bowel, or when extra fluid is secreted into your bowel.

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.

Short-term diarrhoea

Diarrhoea is usually a symptom of a bowel infection (gastroenteritis), which can be caused by:

Other possible causes of short-term diarrhoea include:

Medicines

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.

Long-term diarrhoea 

Conditions that can cause persistent diarrhoea include:

Persistent diarrhoea can also sometimes occur after surgery on the stomach, such as a gastrectomy.

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