Anxiety disorders are generally considered the most common comorbidity with ADHD, affecting nearly 50% of adults with the condition. Other highly prevalent co-occurring conditions include depression (mood disorders), learning disabilities, behavior disorders like Oppositional Defiant Disorder (ODD), and autism spectrum disorder.
ADHD Comorbidities by Prevalence & Age
National Institutes of Health (.gov)
- Anxiety Disorders (Top Overall): Affects roughly 47–50% of adults with ADHD.
- Depression/Mood Disorders: Ranging from 18% to over 50% in adults.
- Behavioral Disorders (Children): Oppositional Defiant Disorder (ODD) is very common in children (up to 34.7%).
- Learning/Language Disorders: Affecting 70–92% of children with ADHD, depending on studies.
- Other common conditions: Autism spectrum disorder (59%), Tic disorders/Tourette’s (55%), and substance use disorders (especially in untreated adults).
Gender and Age Differences:
National Institutes of Health (.gov)
- Children: Commonly paired with ODD, conduct disorder, and learning disabilities.
- Adults: More frequently paired with anxiety, depression, and substance use disorders.
- Females: More likely to have internalizing disorders, such as anxiety and depression.
Over half of children and adolescents with ADHD have a co-occurring psychiatric condition. Identifying these is crucial as they can complicate treatment and increase the total disease burden.