Attention deficit hyperactivity disorder ADHD is a common mental disorder that begins in childhood and can continue through adolescence and adulthood. Children with ADHD can present with inattention, hyperactivity and impulsive behaviors that are greater than other children in their age group. ADHD can make it difficult for children to perform well in school, at home or in the community. Management of ADHD includes medication, behavioural interventions and school intervention.