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Oppositional defiant disorder (ODD) is a repetitive pattern of negative, hostile, and defiant behaviour, especially against parents, teachers, and other authority figures. Children often have frequent tantrums, argue too much, break rules on purpose, and blame others for their mistakes or misbehaviour. These behaviours are more frequent than predicted for their age or developmental level and persist for at least six months. And they result in clinically significant impairment in home and school functioning.

The causes are diverse, including a challenging temperament, inconsistent or harsh parenting, family stress, and neurological vulnerabilities connected to the regulation of emotion. ODD typically co-occurs with ADHD, anxiety, mood disorders, and learning challenges, which can complicate presentation and prognosis. Assessment includes clinical interviews of carers and the child, behaviour rating measures, and DSM-5-TR criteria to differentiate ODD from normal oppositional periods and conduct disorder.

Management is focused on parent management training, family-based treatments, school collaboration, and cognitive-behavioural approaches to frustration tolerance and problem-solving. Medications are used to treat the comorbid conditions, not the fundamental oppositional symptoms. Early systematic intervention improves long-term outcomes and minimises the progression to more severe behavioural disorders.