Internalizing and externalizing problems mediate the relationship between maltreatment and self-harm among UK adolescents.

Emotional abuse and physical abuse were significant predictors of self-harm, and their links with self-harm were partially mediated via internalizing and externalizing problems. Better supervision of maltreatment, and timely intervention for both internalizing and externalizing problems, are critical in preventing self-harm among adolescents.