Background: Suicide is the second leading cause of death among young people worldwide. Research indicates that negative social contexts involving familial and peer relationships have far-reaching influences on levels of suicidality in later life. While previous systematic reviews have focused on evaluating associations between negative life events such as abuse and bullying in childhood and subsequent suicidality, this systematic review examines the prevalence of, and association between the processes of humiliation and shame in later self-harm, suicidal ideation, and suicide among adolescents and young adults.

Methods: A systematic literature search of databases including MEDLINE, Web of Science Core Collection, CINAHL, PsycINFO, and Embase was conducted to identify potential studies. ProQuest was searched to identify relevant grey literature research. A combination of MESH terms and keywords was used. All original quantitative studies published in English that examined the prevalence, or association between humiliation or shame and suicidal behaviours and/or death by suicide were included. Studies were assessed for methodological quality using Joanna Briggs Institute critical appraisal tools. The protocol was registered with the International Prospective Register of Systematic Reviews (PROSPERO) [CRD42022289843].

Results: Narrative synthesis was performed. A total of 33 studies reporting the prevalence of, or association between humiliation (n = 10) or shame (n = 23) and suicidal thoughts/behaviours were included. The prevalence of humiliation among those with any suicidality ranged from 18% to 28.1%, excluding an outlier (67.1%), with two studies presenting a significant association between humiliation and self-harm in their fully adjusted analyses. The studies that outlined humiliation and suicidal thinking (intent/suicide plan) had no association after adjustment for confounders. For shame, half of the studies found an association in adjusted models (n = 10), and this was evident for both suicidal ideation and self-harm.

Conclusion: To our knowledge, this is the first study to attempt a systematic review on this topic. The dearth of research in this field of enquiry is reflective of unique challenges associated with assessments of humiliation and shame in various clinical settings amongst adolescent and young adult populations. Nonetheless, given the importance and relevance of the psychological imprint of humiliation in youth morbidity and mortality in the field of mental health, it is timely to attempt such a systematic review. In light of the associated role of humiliation and shame in self-harm and suicidality among young people, we recommend that these processes need to be explored further via prospective studies and assessed as part of a comprehensive bio-psycho-social assessment when focusing on life stressors for adolescent and young adults presenting with suicidality to emergency departments and mental health services.