One of the difficulties in diagnosing ADHD is that it’s often found in conjunction with other problems. These are called coexisting conditions, and about two thirds of all children with ADHD have one.
The most common coexisting conditions are:
Oppositional Defiant Disorder (ODD) and Conduct Disorder (CD)
At least 35% of all children with ADHD also have oppositional defiant disorder, which is characterized by stubbornness, outbursts of temper, and acts of defiance and rule breaking. Conduct disorder is similar but features more severe hostility and aggression. Children who have conduct disorder are more likely get in trouble with authority figures and, later, possibly with the law. Oppositional defiant disorder and conduct disorder are seen most commonly with the hyperactive and combined subtypes of ADHD.
Mood Disorders (such as depression)
About 18% of children with ADHD, particularly the inattentive subtype, also experience depression. They may feel inadequate, isolated, frustrated by school failures and social problems, and have low self-esteem.
