Bullying is unwanted, aggressive behaviour among school aged children that involves a real or perceived power imbalance. The behaviour is repeated, or has the potential to be repeated, over time. Both kids who are bullied and who bully others may have serious, lasting problems. Bullying may include physical violence, sexual violence, threats, teasing, social exclusion or other psychological violence. The presence of bullying is often a sign of aggressive or violent behaviour elsewhere in children’s lives and young children may be acting out at schools or elsewhere what they have observed and learned at home. Recent studies suggest that bullying in adolescence and childhood can have worse long-term effects on young adult‘s mental health than being subject to maltreatment during childhood.¹

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