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
14 – 15%
19 – 30%
Tics or Tourette Syndrome*
25 – 50%
*60 to 80 percent of those with Tourette Syndrome have ADHD.
Prevalence of coexisting conditions in adults with ADHD
20 – 25%
Up to 20%
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