The purpose of this study was to define wellness tourism from a philosophical and theoretical background on wellness, to clarify the categories of wellness tourism, and to draw its conceptual model. For that purpose, the relationship with related concepts such as medical tourism, healing tourism, and spiritual tourism in the category of health tourism for health enhancement was defined, and the category of wellness tourism was illustrated. Wellness is a new paradigm for health, a process of realizing its potential as a state of integrated physical, emotional, intellectual, spiritual, and social health, and can be defined as a lifestyle to reach an ultimate optimal state of well-being. Therefore, wellness can be seen as a general self-concept of health as a higher-level concept that integrates the domain of health. Wellness tourism is widely considered as a subfield of health tourism, a form of special interest tourism for health motivation. It can also be narrowly defined as a tourism activity that enhances health through physical, emotional, intellectual, spiritual, and social wellness enhancement and excludes medical tourism focused on the treatment of diseases. Wellness tourism can be a wellness lifestyle to reach an optimal state of well-being through not only hedonic experiences of physical health promotion, relaxation, and stress reduction, but also eudaimonic experiences of reflecting on life, the restoration of social relationships, and interaction with nature.