Children sometimes argue, are aggressive, or act angry or defiant around adults. A behavior disorder may be diagnosed when these disruptive behaviors are uncommon for the child’s age at the time, persist over time, or are severe. Because disruptive behavior disorders involve acting out and showing unwanted behavior towards others they are sometimes called externalizing disorders.
The most common disruptive behaviour disorders include oppositional defiant disorder (ODD), conduct disorder (CD) and attention deficit hyperactivity disorder (ADHD). These three behavioural disorders share some common symptoms, so diagnosis can be difficult and time consuming. A child or adolescent may have two disorders at the same time. Other exacerbating factors can include emotional problems, mood disorders, family difficulties and substance abuse.