ADHD is a neurodevelopmental condition with hallmark features in persisting patterns of inattention and/or hyperactivity and impulsivity.

• Symptoms develop in childhood.
• ADHD occurs in 5-7% of children and 2% of adults.
• ADHD is a genetic condition.
• There is a rate of 30-90% of symptoms and impairment persisting into adulthood.
• ADHD is often associated with other cognitive, social and emotional difficulties.
• Emotional dysregulation is often a significant component of ADHD with affective reactivity and emotional lability and an inability to inhibit emotional expression, although it is underrepresented in ADHD.
• ADHD commonly occurs with internalising conditions (anxiety and depression), externalising conditions (Oppositional Defiance Disorder and Conduct Disorder), and sleep problems.