Victimisation in childhood and adolescence is associated with increased risk of adult mental health problems, including anxiety and depression. However, mechanisms and causal pathways underlying the association with clinical anxiety and depression are not fully understood. Based on cognitive theory of anxiety disorders and trauma, this project will explore cognitive and behavioural factors at an individual and interpersonal level that might maintain negative effects of bullying. These prospective analyses will help differentiate those who recover after bullying from those who do not, and inform specific new targets for psychological interventions to help those who suffer clinical anxiety and depression after being bullied.