Understanding ADHD | For Professionals | For Healthcare Professionals | The ADHD Diagnostic Process | Coexisting Conditions
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Coexisiting Conditions

More than two-thirds of individuals with ADHD have at least one other coexisting condition. The symptoms of ADHD—constant motion and fidgetiness, interrupting and blurting out, difficulty sitting still and need for constant reminders, etc.—may overshadow these other disorders. But just as untreated ADHD can present challenges in everyday life, other disorders can also cause unnecessary suffering in individuals with ADHD and their families if left untreated. Any disorder can coexist with ADHD, but certain disorders tend to occur more commonly with ADHD. ADHD may coexist with one or more disorders.


Prevalence of coexisting conditions in children with ADHD

Oppositional Defiant Disorder


Conduct Disorder



14 – 15%


19 – 30%

Tics or Tourette Syndrome*

< 10%

Learning disorder


Speech problems


Sleep problem

25 – 50%

*60 to 80 percent of those with Tourette Syndrome have ADHD.


Prevalence of coexisting conditions in adults with ADHD

Conduct Disorder

20 – 25%

Mood disorder






Bipolar Disorder

Up to 20%

Substance Abuse



For further information on specific co-occurring conditions:

ADHD and Sleep Disorders

ADHD and Depression

ADHD and Disruptive Behavior Disorders

ADHD and Tics and Tourette Syndrome


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