Are other conditions associated with ADHD?

Attention deficit hyperactivity disorder often occurs with other disorders, referred to as comorbidities of ADHD. The combination of oppositional defiant disorder ADHD and its comorbidities presents extra challenges to affected individuals, educators, and health care providers. Diagnosis and treatment are more difficult when ADHD and another condition are present in the same individual.

About half of children with ADHD referred to clinics have behavior disorders as well as ADHD. Oppositional defiant disorder is one of the most common disorders occurring with ADHD. Conduct disorder is less common, can be significantly disruptive, and is difficult to treat. Increased injuries and strained peer relationships are also common in this population.