Can ADHD and autism occur together?
Yes. ADHD and autism co-occurring is very common — an estimated 50-70% of autistic people also have ADHD, and vice versa. The DSM-5 formally recognizes the dual diagnosis.
Until 2013 (under the DSM-IV), ADHD and autism could not be diagnosed together, one ruled out the other. The DSM-5 recognized that the overlap is real and common: the two conditions can and frequently do coexist.
Comorbidity estimates: 50-70% of autistic people also meet criteria for ADHD; 20-50% of people with ADHD have enough autistic traits to warrant an autism diagnosis.
How they overlap: both affect executive function (planning, organization, impulse control), both can cause attention and emotional-regulation difficulties, and both have a strong genetic component that is frequently shared.
How they differ: autism includes qualitative differences in social communication and restricted or repetitive behavior patterns that are not central to ADHD. ADHD tends to involve more prominent motor hyperactivity than typical autism.
Why the dual diagnosis matters: treatment differs. ADHD medication (stimulants) can be very effective for ADHD symptoms even in autistic people, but requires careful monitoring. Support for autism needs to be in place regardless of ADHD treatment.
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