If your child has been diagnosed with autism — or is on the waiting list — you may have also heard ADHD mentioned. Or perhaps your child has an ADHD diagnosis and someone has suggested autism might also be relevant. For many parents, having two conditions in the picture feels overwhelming.
For decades the medical establishment considered autism and ADHD mutually exclusive. That changed in 2013 with the DSM-5. Since then, research has accelerated rapidly.
What Are They, Briefly?
Autism Spectrum Disorder (ASD) — differences in social communication, restricted or repetitive behaviours, and sensory processing.
ADHD — differences in attention regulation, impulse control, and activity levels (inattentive, hyperactive-impulsive, or combined).
Both are neurodevelopmental — lifelong, not caused by parenting, diet, or environment alone.
How Often Do They Co-Occur?
Research in Lancet Psychiatry found that approximately 50–70% of autistic individuals also meet criteria for ADHD. Conversely, 20–50% of people with ADHD also meet criteria for autism.
The term increasingly used by the community is AuDHD. AsIAm provides Irish guidance on dual-diagnosis assessments at asiam.ie.
Are They the Same Condition?
No — distinct conditions with different diagnostic criteria. But they share more biological and genetic overlap than any other two neurodevelopmental conditions.
Shared features include executive function difficulties, emotional dysregulation, sensory differences, transition difficulties, sleep disturbances, and social challenges (for different underlying reasons).
If any of this resonates — you don't have to figure it out alone. Amanda offers free initial consultations.
Book a Free CallHow Are They Different?
An autistic child often has difficulty with too much sensory input and seeks predictability. A child with ADHD often craves novelty and stimulation and struggles with under-stimulation. When both are present, the child can appear contradictory.
Why the Full Picture Matters
Support strategies differ. A strategy that helps with ADHD inattention may not address the communication and sensory support an autistic child also needs. Medicating ADHD without addressing autism support needs can look like medication failure when really the autism dimension wasn't addressed.
In Ireland a thorough psychological assessment — CDNT, NEPS or private — can assess for both simultaneously.
What This Means Day to Day
Children with AuDHD often experience an internal contradiction: the autistic part wants routine and calm; the ADHD part craves novelty and movement.
- ♥Consistent, predictable routines with built-in flexibility
- ♥Frequent movement and sensory breaks
- ♥Clear, visual instructions and task chunking
- ♥Emotional regulation support through therapeutic play
- ♥Parent coaching for your child's specific profile
A Note on Girls and Women
Both autism and ADHD are significantly underdiagnosed in girls — both present differently in females and girls often mask more. ADHD Ireland (adhdireland.ie) and AsIAm have specific resources on gender differences in diagnosis.