Suicide attempts in youth networks precede risk for others

Clinical takeaway: Asking youth whether anyone they know has attempted suicide may flag attempt risk that depression screening alone misses.

Suicide risk assessment in young patients typically starts with symptoms. A clinician screens for depression, asks about suicidal thoughts, and stratifies from there. But some of the youth who go on to attempt suicide would not stand out on either measure. 

One candidate has been in the literature for decades: suicidal behavior appears to spread through social connections, a pattern often described as contagion. Yet most of that research relied on cross-sectional snapshots that could not separate exposure from what followed it, and the findings disagreed on whether knowing someone who attempted suicide relates to the emergence of suicidal thoughts, the progression to action, or both. Much of it also predates the digital social lives young people now lead. A national longitudinal study that followed adolescents and young adults over two years now offers a cleaner read on what exposure precedes, and what it does not. 

Young people who knew someone who had attempted suicide in the prior year had nearly three times the odds of a first suicide attempt, and the association remained significant after adjustment for depressive symptoms. In absolute terms, the adjusted probability of a first attempt was about 3% among exposed youth versus about 1% among those without exposure. Depression mattered on its own, but it did not explain the exposure link. 

Yet among youth with no prior suicidal ideation, those who knew of an attempt were no more likely to begin having such thoughts than those who did not, a contrast suggesting that exposure relates more to the escalation from vulnerability to action than to the emergence of suicidal thinking itself. 

Exposure also tracked with depressive symptoms in both directions the study could measure: symptoms rose within individuals during periods of suicide exposure, and youth with more exposure overall carried higher symptom levels than peers with less. Social connection cut both ways. Larger in-person friend networks were associated with fewer depressive symptoms over time, while larger online networks were associated with more. 

The findings come from Project Lift Up, a national longitudinal cohort of US adolescents and young adults aged 13 to 22 recruited through social media and assessed at baseline, 12, and 24 months. The attempt analysis followed 2,098 participants with no lifetime suicide attempt at baseline; exposure meant reporting anyone they knew who had tried to kill themselves in the past year, without distinguishing whether they learned of it in person or online. Models were lagged so exposure preceded outcomes, and adjusted for demographics, network size, and depressive symptoms. 

The authors' nearest application is postvention with wider reach. Because an attempt may ripple through a shared social environment, they call for proactive outreach in schools, online communities, and youth-serving systems after an attempt becomes known. Network-based prevention already exists; the authors point to Wingman-Connect, a peer-network program tested among Air Force personnel, as the kind of program these findings support. 

"In this cohort study of adolescents and young adults, exposure to suicide attempts within social networks was associated with subsequent suicide attempt onset independent of depressive symptoms but was not associated with new-onset suicidal ideation," the authors conclude. "The findings suggest that social network exposure may have been more closely linked to suicidal behavior escalation than to the emergence of suicidal thoughts during adolescence and young adulthood." 

Source: Mitchell KJ, et al. (2026 Aug 24) JAMA Netw Open. Suicide Risk After Social Network Exposure to Suicide Attempts in Adolescents and Young Adults