The rise of hikikomori research: a bibliometric analysis of an emerging global phenomenon

Abstract

Introduction Hikikomori, characterized by prolonged and severe social withdrawal, has attracted growing international attention as research has extended beyond its original Japanese context. This study examines the growth dynamics, citation impact, productivity patterns, collaboration structure, and conceptual and intellectual development of the hikikomori literature. Methods Data have been retrieved from the Web of Science Core Collection and Scopus databases. Following screening and deduplication, 348 unique publications from 2002 to 2025 have been included. Performance analysis and science mapping techniques have been applied using the bibliometrix R package, Biblioshiny, and VOSviewer. Results Publication output has remained limited during the early years, has become more visible after 2010, and has increased markedly after 2018, with the highest annual output recorded in 2025 (n = 62). Highly cited publications have included both core hikikomori studies and research related to internet addiction, digital behaviors, youth social withdrawal, and measurement. Scientific production has been concentrated among a limited group of authors and institutions, while 14 journals have formed the Bradford core. Japan has remained the dominant contributor, although substantial research activity has also been recorded in Italy, China, the United States, and other regions. International collaboration has been unevenly distributed and has remained less prominent than nationally based research production. Keyword analyses have revealed strong connections among hikikomori, social withdrawal, social isolation, depression, loneliness, mental health, and anxiety. Bibliographic coupling has revealed substantial overlap in shared reference bases, while thematic evolution has shown continuity around hikikomori and social isolation together with the later prominence of mental health, COVID-19, depression, and adolescent-related themes. Conclusion The findings have indicated that hikikomori research has developed into a broader and increasingly international field in which clinical, psychosocial, developmental, cultural, and digital perspectives have been represented. Greater interdisciplinary and cross-cultural engagement has therefore been identified as an important direction for future research.