Diarrhoea
Who's affected?
Diarrhoea is slightly more common in young adults than in older people. The reasons for this difference are unclear. A lack of acquired immunity, more adventurous travel styles or different eating habits may play a part.
Attack rates are similar in men and women.
When to seek help
Diarrhoea usually strikes within the first week, but may occur at any time during the holiday - even after returning home.
If symptoms persist for more than 24 hours or if you develop a high temperature, consult a doctor.
Best treatments
The main risk with diarrhoea is dehydration. However, drinking water will actually encourage the loss of more salts from your body.
Instead, drink an isotonic solution - a quarter of a teaspoon of salt and three level teaspoons of sugar in one pint of sterilised water. This should be drunk at the rate of about a half to three-quarters of a pint every two hours or after each visit to the toilet.
Avoid alcohol, which leads to further dehydration.
Over-the-counter diarrhoea medicine can help if you experience griping pains in the abdomen.
Prevention
Always wash your hands before eating or handling food and after using the toilet. Also, keep your hands away from your face and don't bite your nails.