Mental health problems amongst boys is a growing issue in modern society, however boys are underrepresented in research regarding mental health. On the other hand, boys are overrepresented regarding norm-breaking behavior. This in turn makes it interesting to analyze the correlation between mental health problems and bullying, sexual risk behavior, criminality and substance use (hereafter referred to as norm-breaking behavior). This study’s main aim was to answer the following study questions (a) frequency of mental health problems among boys in the ninth grade, (b) correlation between the variables criminality, bullying, sexual risk behavior, substance use and mental health problems, (c) how the norm-breaking behaviors relate to mental health problems and (d) if there might be other factors that influence mental health. The study makes use of preexisting survey data from the LoRDIA (Longitudal Research on Development in Adolescence) project with a population of 649 boys with a mean age of 14 years.  The LoRDIA project is funded by Vetenskapsrådet, VINNOVA, Formas, Stiftelsen Säfstaholm, Stiftelsen Sunnerdahls Handikappfond och Futurum region Jönköping. The survey employs validated and LoRDIA’s own scales which are then measured with a correlation analysis and multiple regression analysis.  The outcome of the frequency analysis displays that 60 percent of the respondent boys are completely content with life. In the sense that they are happy, have goals and meaning with life and a general satisfaction regarding their health. The result further indicates that criminality has the strongest negative significant relationship with mental health issues, but there are also separate correlations between bullying, substance use and mental health issues. Further results illustrate a negative correlation between wellbeing in residential area and mental health problems. Thus, there is a correlation between norm-breaking behavior and mental health issues amongst boys.