Diarrhoea is 3 or more loose bowel motions per 24 hours. Traveller’s Diarrhoea is Gastroenteritis (“gastro”) that develops shortly after or during travel abroad. It can range from a tummy upset for a day or two, with mild diarrhoea, to more severe diarrhoea, tummy cramps, vomiting, fevers and dehydration lasting several days or longer.