Abstract Background Knowledge on the bi-directional association between employment status and mental health is important, as it affects multiple dimensions of our daily lives, both at the individual and societal level. Given that the mental health status and employment situation of individuals are likely to change over time, there is an important need for longitudinal data to better understand causality patterns in this association and the underlying mechanisms. Methods A systematic review was carried out based on the PRISMA guidelines in 3 electronic databases: PubMed, Embase, and PsycInfo. Studies eligible for inclusion were cohort studies, involving the general population, and assessing the relationship between employment status and mental health longitudinally. Results In total, 3,733 studies were identified and 36 met the inclusion criteria. The eleven studies focusing on the social causation hypothesis highlighted the negative long-term impact of unemployment and unstable employment on mental health. Four studies observed mental health improvements upon re-entering employment, although limited and in more specific contexts. The fourteen studies focusing on the health selection hypothesis found a lower probability for individuals with mental health problems in finding and maintaining employment. Finally, the eleven studies assessing the two hypothesis simultaneously found that mental health problems were both a consequence of and risk factor for poor employment status, although some important moderating factors, such as gender differences, influence the direction and strength of the association. Conclusions This review underscores the bi-directional association between the employment status and mental health of individuals, highlighting the need to develop targeted prevention (e.g. mental health support in the workplace) and interventions strategies (e.g. supported employment programs) in both the mental health and labor market systems. Key messages • The bidirectional link between employment and mental health highlights the need for concurrent responses to break the vicious cycle between poor mental health and social exclusion. • To reduce the clinical and social burden of mental health problems, gender differences must be taken into account in mental health and employment support practices and policies.
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