Nutrients are absorbed in the small intestine. The waste is pushed into the large intestine where the water is removed. Stool obtained is temporarily stored in the rectum and extracted from the body by the anus. The stools are usually firm, moist and easy to evacuate. Diarrhoea is a frequent passage of soft, watery and unformed dung. Acute diarrhoea is the sudden appearance of three or more stools, lasting less than 14 days. The most common cause of acute diarrhea is the intestinal infection, such as gastroenteritis or food poisoning. Viruses are responsible for most cases. The intestinal mucosa becomes irritated and inflamed, making it difficult for water particles to absorb water. In severe cases, even water can escape from the intestinal tract. Acute diarrhoea usually disappears after one to two days. Chronic diarrhoea, which lasts four weeks or more, can be caused by many diseases affecting the intestines, including inflammatory bowel disease (IBD).
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