Why do I always get sick on holiday?

The term leisure sickness was coined by a Dutch psychologist back in 2002, documenting its widespread presence in a study that asked 1,900 people if they came down with an illness on vacations and/or weekends. Three percent of them admitted they did. However, the more plausible reason why a large number of people spend their vacations hugging a bottle of Theraflu and wrapped in blankets is credited to the actual travel itself.