Marked by inappropriate impulsivity, attention and in some cases hyperactivity.
More common in boys than in girls, The most commonly diagnosed childhood behavioural disorders affecting 3-5% of school age children. Children with ADHD may seem less mature and responsibile than their peers. 
Onset of symptoms is typically seen in early childhood, before the age of 7.
May remain restless and fidgety into adulthood and pose life long challenges.
May commonly have co-occurring problems such as School failure, problems with relationships,Speech and language difficulties and various other social, emotional and behavioural disorders.