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Background: In this paper we focus on adolescents in transition towards young adulthood (ATYA). We know from international studies that the transition process makes adolescents vulnerable to mental illness. However, little is known about Belgian ATYA mental-health status. Nor are risk factors associated with their mental illness understood, in particular with regard to depressive and anxiety disorder. The aim of this study is (1) to discuss evolution in time of prevalence of depressive disorder (DD) and anxiety disorder (AD) among Belgian ATYA and (2), to identify risk factors associated with these disorders among ATYA., Subjects and Methods: Data was extracted from the Belgian Health Interview Survey (BHIS), which is a cross-sectional population survey, carried out in 2001, 2004, 2008, and 2013. Information about the population's background characteristics, health services utilization, health behaviours and mental health status were extracted and statistically analyzed., Results: ATYA prevalence of DD and AD was higher in 2013 in comparison with previous years. These changes were significant only for DD (F=4.466, p=0.004). In contrast with younger adolescents, among ATYA odds of DD were 28.2% higher (OR 1.282, 95% CI 0.967-1.698, p=0.084) and, odds of AD were 55.2% higher (OR 1.552, 95% CI 1.137-2.119, p=0.006). For ATYA, a poor quality of social support was the most predictive factor of DD (OR 11.187, 95% CI 5.530-22.629, p<0.0001) and AD (OR 6.238, 95% CI 2.845-13.676, p<0.0001); whereas, having a paid job was the most protective factor with regard to DD (OR 0.282, 95% CI 0.169-0.470, p<0.0001) and AD (OR 0.552, 95% CI 0.330-0.924, p<0.024)., Conclusion: Prevalence of mental illness among Belgian ATYA appears to worsen in time. In comparison with younger adolescents, ATYA are more vulnerable to anxiety disorders. Adverse and protective risk factors were identified and discussed in a way to improve access, continuity and mental healthcare pathways for Belgian ATYA.