Catarrhal diarrhoea

Non-infectious diarrhoea
Catarrhal diarrhoea is the ordinary form of non-infectious diarrhoea. It occurs when the intestinal mucous membrane is in much the same condition of congestion and swelling as the nasal membrane during a "cold of the head", and secretes a great amount of clear, viscid mucus of a similar nature to that coming from a runny nose.
Uncomplicated catarrhal diarrhoea may be produced in a slight degree by indigestible food, by nervous excitement, or as the result of a chill or change of weather. In severer form it may be due to [Salmonella] bacteria, which are responsible for food poisoning, or to drugs. It may precede many diseases, such as appendicitis or a urinary tract infection.
(E) Emanations of other problems