Health tourism is the fastest growing and most efficient branch of tourism in the world. Trends in population aging and health orientation certainly greatly affect the extremely high annual growth rates of this type of tourism and indicate that health tourism has the potential to become one of the most important reason to encourage people to travel in the future. Health tourism affects market development and its expansion, thus encouraging the production of many types of goods, which have a secure market through this type of tourism. As a result, increase in employment is evident and significant flow of financial resources, which improves living standard of each country. The Republic of Croatia developed the National Program – Action Plan for the Development of Health Tourism, which is important for health tourism development and increasing its competitiveness. It was noticed that in Krapina-Zagorje County for several years back has been a trend of strengthening health tourism which also entails development of other types of tourism. The reason is that Krapina-Zagorje County has many thermal springs used in the treatment of chronic and acute diseases, while at the same time they provide preventive therapy and recreation to healthy people with aim of preserving and improving the general health affected by modern lifestyles. The county also has thermal springs that are not in use so this should be validated better in order to county benefit from its thermal potential. The area of Krapina-Zagorje County has great potential to achieve significant economic and health-tourism goals, with planned and rational development, that would otherwise be unachievable.