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Travel health risks are primarily classified as infectious or non-infectious. Travel-related risks vary according to traveler factors, destination factors, type and reason of travel, duration of travel, accommodations, and budget. Although infectious disease mortality is estimated to be less than 1% of deaths during travel, infection with lethal diseases such as malaria occurs due to lack of effective preventive services before travel. Also, the risk of infectious disease is higher for those who travel to developing countries. Many overseas deaths are due to natural causes, with cardiovascular disease being the most common cause. Traffic accidents are estimated to be the most common cause of death among travelers to developing countries.