Irritable bowel syndrome
This chronic condition is a combination of attacks of diarrhoea and intermittent constipation. It can involve disturbance of muscular movement in the large intestine. The cause of irritable bowel syndrome (IBS) is unknown but the disorder can be aggravated by stress, and may be linked to sensitivity to particular foods. Other symptoms of IBS include abdominal cramps, bloating, and passage of mucus with the faeces.