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Accessible summary What is known on the subject? Self-harm is a relatively common occurrence in adolescents; however, there remains a lack of understanding about the motivations behind adolescent self-harm, and this poor understanding can have a negative impact on how mental health professionals respond to young people who self-harm., What does this paper add to existing knowledge? This paper identifies the reasons for self-harm in a community sample of young people and finds that the functions of self-harm differ for different people and that there may be multiple reasons for self-harm., Findings provide support for the affect-regulation model of self-harm which states that young people self-harm to regulate how they are feeling, but provides little support for the interpersonal influence model which proposes that self-harm is an attempt to influence how other people respond to them. , What are the implications for practice? Self-harm for most young people serves at least one specific function and is an indication of distress., There is a requirement for a non-pathologizing response towards young people who self-harm; self-harm should be understood as a meaningful behaviour rather than a symptom of an illness., Mental health nurses need to understand the multiple functions of self-harm. A better understanding of the individualized meaning behind self-harm can positively impact on attitudes towards young people who self-harm and provide for improved mental health service provision., Abstract Introduction Although self-harm is a relatively common occurrence in adolescents, there is a lack of understanding about the motivations behind it. A poor understanding of self-harm contributes to negative perceptions about those who self-harm and a poor healthcare experience. Aim & Methods This study identifies motivations behind self-harm in school-based adolescents using a cross-sectional survey. Motivations behind self-harm were elicited using a scale and open-ended responses. Results Of the 856 adolescents who completed the survey across 11 postprimary schools, 103 reported a history of self-harm. The most commonly endorsed reason for self-harm was to 'get relief from a terrible state of mind' (79%). Open-ended responses were consistent with scale responses with most reporting that they self-harmed to relieve distressing emotions. Discussion Findings provide support for the affect-regulation model of self-harm with support also demonstrated for the self-punishment and antidissociation models. There was little support for the interpersonal influence model suggesting that the commonly held belief that self-harm is attention-seeking is one attributed by others to young people, and not widely reported by young people themselves. Implications for practice Mental health services need to be responsive to the needs of young people who self-harm which requires eliciting and understanding the individual and multiple meanings behind self-harm to best inform treatment options. [ABSTRACT FROM AUTHOR]