Mid-teen spike in suicidality among sexually diverse adolescents highlights need for targeted support

Research on a Quebec cohort reveals that sexually diverse teenagers experience a sharper increase in suicidal thoughts during mid-adolescence, prompting calls for sustained mental health support during vulnerable years.

Teenagers whose attractions are not limited to the opposite sex appear to face a sharper increase in suicidal thoughts and behaviour in the middle years of adolescence, according to research based on a long-running Quebec birth cohort published in The Canadian Journal of Psychiatry.

The study followed 1,505 young people from the Quebec Longitudinal Study of Child Development, a population-based cohort of babies born in Quebec between October 1997 and July 1998. Researchers tracked past-year suicidal ideation and attempts at ages 13, 15, 17 and 23, and assessed sexual attraction at 15 or 17 between 2013 and 2015. About 11.5% of participants, or 173 adolescents, reported sexually diverse attraction, including same-sex attraction, attraction to both sexes or no sexual attraction at either assessment.

At age 13, the two groups were broadly similar. But by 15 and 17, suicidality had risen more steeply among sexually diverse adolescents than among those who consistently reported attraction only to the opposite sex. The gap then narrowed by age 23, although the authors still described some remaining elevation in risk. The pattern suggests that the period when identity, friendships and school pressures intensify may also be the point at which vulnerability becomes most pronounced.

The research also found that sex assigned at birth shaped the trajectory. Among adolescents assigned female at birth, sexually diverse young people showed a sharper rise through adolescence and a steeper decline into young adulthood than heterosexual females. Among those assigned male at birth, the overall pattern was flatter and the groups did not differ significantly in their trajectories, although sexually diverse boys still showed higher severity at 15 and 17. The authors cautioned that the sexually diverse male group was relatively small, so that result should be interpreted carefully.

Researchers said the mid-teen peak likely reflects a collision between ordinary developmental change and minority stress, including stigma, rejection and discrimination. They also noted that earlier American studies had already pointed to mid-to-late adolescence as a high-risk period for sexual minority youths. Even though the Quebec cohort grew up in a more accepting environment than many earlier samples, the disparity remained visible. That is one reason the authors argue for sustained support through the teenage years and into young adulthood, with particular attention to school climate, accessible mental health care and community support.

The study does have limits. It did not separate bisexual attraction from other sexually diverse experiences, did not assess gender identity in adolescence and the sample was about 90% White. Attrition was adjusted for statistically, but some of the young people at highest risk may still have been missed. Even so, the findings add to evidence that prevention efforts should be timed to the middle teenage years, when the risk appears to rise fastest for sexually diverse adolescents, especially those assigned female at birth.