Overlaps & Co-occurrence
ADHD and autism frequently co-occur, and many conditions can look similar. Understanding overlaps helps prevent misdiagnosis and ensures appropriate support.
of autistic children also meet criteria for ADHD
of children with ADHD show autistic traits
average delay to correct diagnosis when both present
Until 2013, clinical guidelines prevented diagnosing both autism and ADHD together. This led to generations of children receiving only partial diagnoses.
Today we know co-occurrence is common, but assessment practices haven't always caught up. Many children still receive one diagnosis when they have both, or are misdiagnosed with anxiety or behavioural problems.
Understanding overlaps helps you advocate for comprehensive assessment and ensure your child gets the full picture.
Explore Overlaps
| Feature | ADHD | Autism | Both |
|---|---|---|---|
| Attention | Variable, interest-dependent | Deep focus on interests | Highly variable, complex |
| Social | Impulsive, may interrupt | Differences in social cognition | Both patterns present |
| Flexibility | Impulsive shifts | Prefers routine, resists change | Contradictory - rigid yet impulsive |
| Sensory | Seeking stimulation | Over/under-sensitivity | Complex sensory profile |