The Most-Asked Question: Can You Have Both ADHD and Autism?
Yes. For a long time, the medical field considered ADHD and Autism Spectrum Disorder (ASD) mutually exclusive — you could only have one. But the DSM-5 (2013) officially removed that restriction, acknowledging that the two can be diagnosed together. Behind that change is a large body of research: having both at once — often called AuDHD — is genuinely common.
The numbers: around 30-50% of autistic people also meet criteria for ADHD, while a smaller share of people with ADHD (~14-30%) also meet autism criteria (a common estimate in population research). The two are absolutely not "either/or."
If you've long felt "I look like ADHD and also like autism," and been told "you can only pick one," this article is for you.
Important: This article describes how ADHD commonly co-occurs with other conditions for educational purposes only. It does not constitute medical diagnosis or treatment advice. The percentages cited come from group-level research and do not predict your individual case. Whether you have a condition and how to address it must be determined by a psychiatrist or qualified clinician in an in-person evaluation. If this article concerns you, the right step is to seek a professional assessment rather than self-diagnosing.
Why Do They Overlap?
- Both are neurodevelopmental differences: ADHD and autism both belong to the neurodevelopmental category — both involve brain wiring and functioning that formed differently in early development from the neurotypical pattern. They are neighboring regions on the "neurodiversity" spectrum.
- Shared genetic factors: Family and twin studies show significant genetic overlap. Within a single family, ADHD and autism often appear together, suggesting shared genetic susceptibility.
- This isn't "diagnostic inflation": The overlap is a real biological phenomenon, not a flood of over-labeling.
How Are They Similar?
Because they share a neurodevelopmental basis, ADHD and autism have considerable overlap in how they present — which is also why they're easy to confuse:
- Sensory sensitivity: Both can involve heightened sensitivity to sound, light, touch, smell, and more.
- Social differences: Both can make socializing feel effortful — though for different reasons (more on this below).
- Executive function struggles: Planning, organizing, starting tasks, switching tasks — both can be difficult.
- Special interests / hyperfocus: ADHD "hyperfocus" and autistic "special interests" look remarkably similar — both can drive startling amounts of energy into a single topic.
How Are They Different? (This Is the Key)
The similarities invite confusion, but the differences are what tell you whether both are present. This table is the most important part of this article:
| Dimension | ADHD | Autism (ASD) |
|---|---|---|
| Social motivation | Wants connection but misses cues, interrupts, overshares | May not crave frequent social contact; often prefers a few deep relationships |
| Response to change | Craves novelty, easily bored by routine | Craves predictability, relies on routine, change brings anxiety |
| Attention pattern | Shifts easily, "interest-driven," hard to sustain on dull tasks | Deep, sustained focus on specific interests |
| Sensory pattern | Sensitive but often fluctuating, tied to state | Sensitivity patterns more stable, specific, often with strong seeking or avoiding |
| Impulsivity | A core feature — speaking and acting before thinking | Usually not a core issue |
| Emotion / empathy | Strong mood swings; empathy often intense but expressed differently | Empathy may be experienced and expressed in atypical ways |
A few points to help you judge:
- ADHD wants to socialize but keeps "messing up": They crave connection but interrupt, miss hints, over-share excitedly — high social motivation, unstable skills.
- Autism's social difference is more about "motivation": It's not that they can't — they may simply not crave frequent socializing, preferring a few, deep, predictable relationships.
- ADHD seeks novelty, autism relies on sameness: If someone "needs novelty AND predictability," often showing both in different contexts, that can be AuDHD.
- Hyperfocus vs special interests: ADHD hyperfocus shifts with interest; autistic special interests tend to be deep, long-lasting, and focused on fixed topics.
Why Do Both Diagnoses Matter?
Recognizing "both are present" isn't about collecting labels — it directly shapes the support strategy:
- Different support needs: ADHD strategies (external structure, reminders, medication) and autism strategies (sensory environment adjustments, explicit social-communication rules, respecting routine) are different. Identify only one, and you miss the specific difficulties the other brings.
- Avoiding "the wrong tool": For example, stimulant medication may work differently for autistic people, even intensifying sensory sensitivity or anxiety; and for core ADHD problems, "building routine" alone is often insufficient. Identifying both lets interventions be more precise.
- Self-understanding: Many people, once they recognize both, finally have a complete explanation for "why am I so contradictory" — needing novelty but also sameness, craving social contact but easily exhausted, hyperfocused yet easily distracted. This isn't contradiction — it's the lived experience of AuDHD.
The Recommended Dual-Screening Path
If you feel you look like both, the most practical move is to screen each separately:
- Screen ADHD first: Use the adult ADHD self-test based on the ASRS scale to assess attention, hyperactivity, and impulsivity traits.
- Then screen autism: Use the adult ASD (AQ) self-test to assess social, communication, attention-pattern, and sensory dimensions.
- Compare results: If both are clearly elevated, the likelihood of AuDHD (ADHD + autism) is high, and bringing both results to a psychiatrist or clinical psychologist for formal assessment makes sense.
To be clear: self-tests are screening tools, not diagnoses. Adult neurodevelopmental assessment is genuinely complex, and a final diagnosis must be made by an experienced professional.
A Word for Anyone Who Read This Far
If you've long felt "I look like ADHD and also like autism," been given different labels by different people, and always felt "none of them is quite right" — that may well be precisely because both are present. Seeing yourself completely is the beginning of understanding yourself.
If you're ready, you can start with these two short self-tests: the adult ADHD test and the adult ASD (AQ) test. Each takes just a few minutes.
This article is for general educational purposes only and does not constitute medical diagnosis or treatment advice. Adult ADHD and autism assessment is complex, and any final diagnosis must be determined by a psychiatrist or clinical psychologist in an in-person consultation. If these differences are significantly affecting your daily life, work, or relationships, please seek a professional evaluation.