How do I define international tourism?

According to the United Nations and World Tourism Organization, international tourism is travel to a country outside of the one’s residential country. The purpose of the visit is not for business purposes and lasts for less than 12 months. Additionally, the tourist must spend at least one night in commercial or private accommodations.

International medical tourism is expanding the economies of several countries, such as Costa Rica. The uninsured are flocking to countries where medical and dental care costs are almost 80 percent lower than in their own country. Costa Rica alone had about 40,000 medical tourists in 2011, according to a Skift article.