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, is the condition of having at least three loose or liquid bowel movements each day. It often lasts for a few days and can result in dehydration due to fluid loss. Signs of dehydration often begin with loss of the normal stretchiness of the skin and changes in personality. This can progress to decreased urination, loss of skin colour, a fast heart rate, and a decrease in responsiveness as it becomes more severe. The most common cause is an infection of the intestines due to a virus, bacteria, or parasite; a condition known as gastroenteritis. These infections are often acquired from food or water that has been contaminated by stool, or directly from another person who is infected. It may be divided into three types: short duration watery diarrhoea, short duration bloody diarrhoea, and if it lasts for more than two weeks, persistent diarrhoea. The short duration watery diarrhoea may be due to an infection by cholera. If blood is present it is also known as dysentery. A number of non-infectious causes may also result in diarrhoea, including , lactose intolerance, inflammatory bowel disease, a number of medications, and irritable bowel syndrome.

Diarrhoea