Diarrhoea is a condition in which an individual passes frequent loose or watery stools. It is caused as a result of the infection of water-borne bacteria, indigestion or food poisoning. As it involves frequent passing of loose, watery stools, a large amount of water and salt is lost from the body, which can be fatal. Dehydration can affect the metabolism of the body, and the body may not be able to carry out its normal functions.