According to a new survey commissioned by Self-Harm UK, The Mix and YoungMinds, a third of 16-25 year-olds in Britain have at some point self-harmed. Despite these rising numbers, confusions and contradictions persist in the way we define and conceptualise self-harm. To mark Self-Harm Awareness Day on March 1, Professor Stephen Briggs addresses the link between suicide and self-harm, and explains why they need to be understood in the context of core developmental struggles.