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A guide for health professionals to interpret and use recommendations in guidelines developed with There have been various changes in the diagnostic criteria for mental disorder since introduced in the 1970s, and now several diagnostic assessments are needed to diagnose mental disorders.1,2) Studies of psychiatric epidemiology conducted in several countries have reported differences in regional and genetic characteristics, as well as the influence of these changing diagnostic criteria.3) A meta-analysis of 174 surveys in 63 countries reported that the prevalence of mental disorders was steadily increasing.2) When asked if they had ever experienced a mental illness at least once in their lifetime, 29.2% of subjects of the general population answered yes, and 17.6% reported that it had lasted more than a year. Also, according to sex, drug addiction was more common in men, and disorders related to mood or anxiety were more common in women. This study reported that regional differences in mental disorders were also observed: there were not only fewer studies on the prevalence of mental disorders in East Asia, but also a lower prevalence of mental disorders than in other regions. However, several studies on the prevalence of mental disorders in South Korea reported a fairly high prevalence and a rapidly increasing