AuDHD: When You Have Both ADHD and Autism (2026)

If you have both ADHD and autism, you already know that neither label on its own quite captures your experience. The ADHD brain craves novelty and stimulation; the autistic brain craves predictability and routine. Living with both means navigating that tension every day. The community term "AuDHD" captures this — though you won't find it in any diagnostic manual. Clinically, it means two separate diagnoses: ADHD and autism spectrum disorder.

The term gained traction in neurodivergent communities because it captures a lived experience that is qualitatively different from having either condition alone. People with both conditions often describe a unique internal conflict — the ADHD brain craving stimulation and novelty while the autistic brain craves predictability and routine. Neither condition's description alone captures this experience.

A brief history of dual diagnosis: Prior to 2013, the DSM-IV explicitly prohibited diagnosing ADHD and autism in the same person. Autism was an "exclusion criterion" for ADHD. This meant an entire generation of people with both conditions could only receive one diagnosis — typically whichever was identified first. The DSM-5 (2013) removed this exclusion, allowing clinicians to diagnose both conditions simultaneously for the first time.

Despite this change being over a decade old, many clinicians trained under the DSM-IV framework still operate with an either/or mindset. The 2023 Australian Senate inquiry into ADHD heard evidence that diagnostic practices have been slow to catch up with the research on co-occurrence, contributing to missed and incomplete diagnoses.

The co-occurrence of ADHD and autism is far more common than chance alone would predict. Research consistently finds:

• 50–70% of autistic people also meet diagnostic criteria for ADHD (Leitner, 2014; Rommelse et al., 2010)
• 20–50% of people with ADHD meet criteria for autism spectrum disorder (Antshel et al., 2016)
• Twin studies suggest a shared genetic basis accounting for 50–72% of the overlap (Ronald et al., 2008)

These figures are significantly higher than population prevalence rates for either condition alone. ADHD affects approximately 5–8% of children and 2.5–4% of adults; autism affects approximately 1–2% of the population. If the conditions were independent, you would expect overlap in less than 0.5% of people — not the 30–50% observed in clinical samples.

The AIHW reports that ADHD medication dispensing in Australia has increased dramatically, from approximately 1.2 million PBS prescriptions in 2018–19 to over 3.1 million in 2023–24. While specific data on AuDHD prevalence in Australia is limited, the growth in both ADHD and autism diagnoses suggests that dual identification is becoming increasingly common.

The AADPA Clinical Practice Guide (2022) explicitly acknowledges the high co-occurrence rate and recommends that clinicians conducting ADHD assessments should screen for autism, and vice versa. Despite this recommendation, screening for the other condition is not routine practice in Australia.

Getting accurately diagnosed with both ADHD and autism in Australia is genuinely hard — and if you've been through multiple assessments that each only caught half the picture, you're not alone. Here's why it's so difficult:

Symptom masking: Each condition can mask the other. A person's autistic need for routine might compensate for ADHD disorganisation, making the ADHD less visible. Conversely, ADHD-driven social impulsivity might mask the social communication differences typical of autism, making the autism less apparent. Clinicians who are not experienced with co-occurrence may see only the more obvious condition.

Clinician training gaps: Many psychologists and psychiatrists specialise in one condition but not both. An ADHD specialist may not recognise autism; an autism specialist may attribute executive function problems to autism alone and miss the ADHD component. The Senate inquiry heard that clinicians sometimes dismiss the possibility of co-occurrence based on outdated DSM-IV exclusion rules.

Assessment tool limitations: Standard ADHD assessment tools (DIVA-5, CAARS, ASRS) do not screen for autism. Standard autism assessment tools (ADOS-2, ADI-R) do not screen for ADHD. A comprehensive assessment for both conditions typically requires separate evaluations, which means more appointments, more cost, and more time.

Masking in women and girls: Women with AuDHD are particularly likely to be missed. Both ADHD and autism present differently in women, and the compensatory masking strategies women develop can be extraordinarily effective at hiding both conditions from clinicians. The Monash University HER Centre research documented that women with ADHD are diagnosed on average 5 years later than men — add autism to the picture and delays can be even longer.

Practical tip: If you suspect you have both conditions, look for a clinician who specifically lists experience with both ADHD and autism in adults. A comprehensive neuropsychological assessment is often the most thorough pathway. See our guide on what to expect during an ADHD assessment for more on the process.

If you have AuDHD, you probably know this feeling: you desperately want a routine that works, and you also desperately want to blow it up and do something new. That push-pull between your ADHD and autistic sides is the defining experience of AuDHD. Understanding these specific conflicts can help you stop blaming yourself and start designing strategies that actually work for *your* brain:

Novelty vs routine: ADHD drives you toward new experiences, spontaneity, and stimulation. Autism drives you toward sameness, predictability, and routine. The result is often a pattern of enthusiastically starting new routines (ADHD novelty-seeking), then becoming distressed when the routine is disrupted (autistic need for predictability), then abandoning the routine because it has become boring (ADHD again).

Social needs: ADHD often comes with a desire for social connection and a tendency to overshare or be impulsive in conversations. Autism may involve difficulty reading social cues, needing more time to process social information, and requiring recovery time after socialising. Many people with AuDHD describe wanting connection intensely but finding it exhausting.

Sensory processing: Both conditions involve atypical sensory processing, but in different ways. ADHD can involve sensory seeking — needing music, movement, or fidgeting to concentrate. Autism often involves sensory avoidance — being overwhelmed by noise, light, or texture. A person with AuDHD might need background noise to focus (ADHD) but be overwhelmed by unpredictable noise (autism).

Emotional regulation: Both ADHD and autism involve emotional dysregulation, but the triggers differ. ADHD emotional dysregulation is often linked to frustration, boredom, or rejection sensitivity. Autistic emotional responses are often triggered by sensory overload, unexpected changes, or masking fatigue. With both conditions, the emotional landscape is particularly intense.

Executive function: ADHD executive dysfunction typically manifests as difficulty with initiation, sustained attention, and task-switching. Autistic executive dysfunction often involves difficulty with cognitive flexibility, planning, and transitioning between activities. Together, these create a compounded challenge that can make everyday tasks significantly harder than either condition alone would suggest.

Managing AuDHD requires an integrated approach that acknowledges both conditions simultaneously, rather than treating them as separate issues:

Medication: ADHD stimulant medications (methylphenidate, lisdexamfetamine, dexamfetamine) can be effective for the ADHD component of AuDHD. However, some people with co-occurring autism report that stimulants increase sensory sensitivity or anxiety. This does not mean medication is contraindicated — it means that dose titration may need to be more careful and gradual, with close monitoring for sensory side effects. Non-stimulant options (atomoxetine, guanfacine) may be better tolerated in some cases. See our ADHD medication guide for detailed information on available medications.

Therapy: Standard CBT protocols for ADHD may need significant adaptation for AuDHD. Key modifications include: more concrete and structured sessions, visual aids and written summaries, explicit instruction rather than inference-based approaches, and accommodation for sensory needs in the therapy environment. Acceptance and Commitment Therapy (ACT) is increasingly used for autistic adults and may complement ADHD-focused interventions.

Occupational therapy: OT can address sensory integration challenges, develop personalised sensory diets, and build practical strategies for daily living skills. This is often one of the most immediately helpful supports for AuDHD.

NDIS access: Autism is a listed condition under the NDIS, meaning it has a more straightforward pathway to eligibility than ADHD alone. A person with both diagnoses may find that the autism diagnosis strengthens their NDIS application, particularly where ADHD contributes to functional impairment. The Senate inquiry (Chapter 7) documented significant barriers for people with ADHD accessing the NDIS and recommended that ADHD be considered as a primary disability. For more detail, see our guide on whether ADHD is a disability in Australia.

Cost considerations: Dual diagnosis assessment and treatment is more expensive than single-condition pathways. The average initial consultation fee for providers in our directory is $557. Medicare rebates apply to both psychiatrist and psychologist sessions under standard item numbers, but the total number of sessions required is typically higher.

Not all ADHD providers are equipped to assess or treat co-occurring autism, and not all autism providers understand ADHD. Finding someone experienced with both is important for accurate diagnosis and effective treatment.

What to look for in a provider:

• Explicitly lists both ADHD and autism as areas of clinical experience
• Conducts comprehensive assessments that screen for co-occurring conditions rather than stopping at the first diagnosis
• Is familiar with DSM-5 dual diagnosis — if a clinician says you "can't have both," they are operating on outdated criteria
• Has experience with adults — most dual-diagnosis expertise has historically been concentrated in paediatric services
• Understands masking — particularly important for women and people diagnosed later in life

Assessment pathways:

• A psychiatrist can diagnose both conditions and prescribe medication in a single clinical relationship
• A clinical psychologist with neuropsychological assessment experience can conduct comprehensive testing for both conditions but cannot prescribe medication
• A multidisciplinary team (psychiatrist + psychologist + OT) provides the most comprehensive assessment but is the most expensive pathway

Use our directory to search for providers who list experience with both ADHD and autism. Filter by your state and look for providers accepting new patients. Currently, approximately 10% of providers in our directory are accepting new patients.

For a detailed comparison of ADHD and autism symptoms and how clinicians distinguish them, see our companion guide: ADHD and Autism — How to Tell the Difference.