What is AuDHD?
AuDHD is a community-used term describing the co-occurence of autism spectrum disorder (ASD) and attention-deficit/hyperactivity disorder (ADHD) in the same individual.
Both are neurodevelopmental conditions that begin in childhood and can influence cognition, sensory processing, emotional regulation, communication, learning, and daily functioning.
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About Autism Spectrum Disorder (ASD)
Autism is characterised by:
Differences in social communication and interaction (e.g., social reciprocity, interpreting social cues, use of pragmatic language)
Restricted and repetitive patterns of behaviour, interests, or activities (e.g., strict routing, intense interests, repetitive movements)
Sensory differences (e.g., hyper- or hypo-reactivity to sensory input, seeking sensory input)
Prevalence in Australia:
According to the Australian Bureau of Statistics in 2022, there are more than 290,000 Australians that have a diagnosis of Autism (ABS survey of Disability, Ageing and Carers (SDAC)).
290,000+
290,000+
205,200
2018
2022
However, the number of people living with autism is likely to be substantially higher.
This can be for many different reasons, for example:
Historical approaches to diagnosis
Cost
Wait times to receive diagnosis
May not feel diagnosis is the right path
Impact on Education:
Of Autistic persons aged 15 years and over
Only 5.2% had a Bachelor degree or higher, compared with 35.3% of persons without disability.
17.3% had an Advanced Diploma, diploma, or certificate III/IV as their level of highest educational attainment, compared to 27% of persons without disability.
Autistic females (32.9%) were more likely than Autistic males (13.8) to have attained an educational qualification higher than Year 12 level.
Impact on Workforce:
Participation in the workforce is important for social inclusion and economic independence, but Autistic people [may] encounter barriers to entering the labour market.
(Amaze - Autism and Employment)
In 2022, 71,500 (50.2%) of Autistic people of working age were participating in the labour force. Compared to 84.9% of people without disability of working age.
The unemployment rate for Autistic people of working age was 18.2%, almost six times the rate of people without disability (3.1%).
About Attention Deficit-Hyperactivity Disorder (ADHD)
ADHD is characterised by:
Inattention (e.g., high distractibility, difficulty sustaining attention, disorganisation, day dreaming)
Hyperfocus (e.g., intense attention on one activity or topic that may not be of their choosing)
Hyperactivity and/or impulsivity (restlessness, interrupting, acting without considering consequences)
Prevalence in Australia:
Australia doesn't have a single prevalence count for ADHD equivalent to SDAC.
The most cited national figures are from the NHMRC's ADHD Clinical Practice Guideline and Deloitte's Social and Economic Costs of ADHD in Australia which estimate that over 800,000 (2.9%) of Australians are diagnosed.
800,000+
533,000
281,000
Although some professionals question overdiagnosis, evidence indicates that as ADHD has become better identified across demographics, it is highly likely to be under-diagnosed in the community.
children
adults
This can be for many different reasons, for example:
Historical approaches to diagnosis
Cost
Wait times to receive diagnosis
May not feel diagnosis is the right path
Impact on Education:
There is no Australian reporting on higher-learning outcomes for those with ADHD.
One research study from Western Galilee College found that while 59% of 'no ADHD' participants pursued a Bachelors degree, only 21% of those 'Diagnosed ADHD' and 20% of those 'Undiagnosed ADHD' pursued the same.
These rates fell even lower for Masters degrees with only 12% for both eligible 'Diagnosed- and Undiagnosed-ADHD' participants pursuing Masters degree compared with 76% of eligible 'no ADHD' participants.
Impact on Workforce:
According to the Deloitte report linked above, productivity costs resulting from reduced workforce participation, absences from work, and reduced productivity while at work make up 81% of total financial costs. Estimated to be around $10.3 billion out of a total financial cost of $12.8 billion.
About AuDHD
AuDHD is a community-used term describing the co-occurrence of ASD and ADHD in the same individual. It is not a single clinical diagnosis in classification manuals, and until the DSM-V in 2013, it was not possible to dual-diagnose clinically.
Key features of AuDHD:
Many people with AuDHD have both the strengths and difficulties associated with their Autism and ADHD.
The traits of both conditions interact in ways that are complex and individualised. On occasion, one condition may to help compensate for the other, but most often they create conflicting needs:
Sensory seeking, and also sensory sensitivity and avoidance
Need for constant stimulation, and being easily burned out
Needing more rest and recovery, and not being able to rest or sleep due to physical or mental hyperactivity
Seeking novelty and new ideas, and finding change difficult to manage
Needing routine to function, and finding routine difficult or impossible to start and maintain
Even though AuDHD is not a formal diagnosis, it is a real-lived-experience for many people as they face:
Executive functioning challenges - including planning, prioritisation, task switching, time management, and inconsistent performance
Sensory processing variability - including both hyper- and hypo-sensitivity
Social communication differences - including masking, mis-attuning, fatigue, and a preference for clarity
Emotional regulation demands - including overwhelm, dysregulation, and burnout associated with cumulative demands
Variable functional profiles - where strengths (e.g., pattern recognition, deep expertise, creativity) coexist with areas needing support.
For the increasing number of those who identify as having AuDHD, improved understanding and support is important - not just for the individual, but also for their families, educators, employers, and support workers.
Prevalence in Australia:
As it was not possible for dual-diagnosis of co-occurring Autism and ADHD until 2013, and these conditions are assessed separately, there is no formal number of people affected within Australia.
523,000
85,500
lowest prevalence
probability
highest prevalence probability
Due to this lack of official statistics, we are left with extrapolating data from international studies on co-occurrence which leave wild ranging results.
These results have a low prevalence probability of 85,500 Australians having AuDHD, up to a high prevalence probability of over 523,000.
Why it's important to be identified as AuDHD if you have both:
AuDHD people are twice as likely to die as the general population (~16 years less life expectancy)
AuDHD people most likely to die from injury or poisoning (including accident and suicide) with suicide attempts at five times higher than the general population.
Nervous system disorders were the next common cause of death. Compared to the general population who are most likely to die from cancer, heart attack, or stroke.
Gender, geography, and wealth are not associated with increased likelihood of death, unlike in the general population
AuDHD people are more likely to experience complex health issues, chronic illness, neurological issues, and chronic pain.
What AuDHD can mean for individuals
AuDHD is not defined by a single “look”; presentations vary widely. Common clinically relevant impacts may include:
Cognition and executive functioning
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Difficulties with planning, prioritising, initiation, working memory, and time management;
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“Task switching” costs; difficulty moving between activities or contexts;
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Periods of hyperfocus; uneven performance depending on interest, stress, sensory load, and sleep.
Sensory processing and nervous system regulation
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Sensory hyper-reactivity (sound, light, texture, smell) or sensory seeking;
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Elevated baseline arousal; vulnerability to overstimulation;
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Need for recovery time after high-demand environments.
Social communication and relationships
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Differences in pragmatic language (tone, timing, inference, indirect requests);
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Social masking/camouflaging (often with cumulative fatigue);
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Misattunement in group dynamics; preference for direct, unambiguous communication.
Emotional regulation and mental health
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Emotion dysregulation, irritability, overwhelm, shutdown or meltdown responses;
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Increased risk of comorbid anxiety, depression, trauma-related symptoms, sleep disturbance, and burnout (particularly with chronic invalidation, unsupported needs, or high masking demands).
Daily functioning and quality of life
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“High functioning” labels can obscure support needs; functional capacity can be variable;
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Activities of daily living may be impacted (meals, hygiene, admin, finances) despite strengths in other areas.
Important note: AuDHD is a disability for many people in some settings; it can also include significant strengths (pattern recognition, creativity, deep expertise, honesty, persistence). Support should be individualised and needs-based rather than assumption-based.
What AuDHD can mean for supporters
(partners, family, friends, carers)
Supporting someone with AuDHD is most sustainable when it is predictable, practical, and respectful of autonomy.
Helpful principles
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Assume genuine effort: Difficulties are often neurologically mediated (executive functioning, sensory overload), not a lack of care.
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Reduce ambiguity: Clear, concrete language; one request at a time; specify “what good looks like”.
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Co-regulation: Calm tone, reduced sensory input, and non-urgent pacing can prevent escalation.
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Protect recovery time: Social and sensory load has a cost; rest is not optional.
Practical strategies
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Use shared systems: checklists, calendars, reminders; keep them simple and consistent.
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Agree on communication protocols: how to raise issues; how to pause and return; which supports are helpful during overwhelm.
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Plan for overload: identify early warning signs; create a de-escalation plan (quiet space, reduced talking, hydration, time-out).
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Respect sensory needs: lighting, noise, clothing, food texture, and personal space matter.
What AuDHD can mean for
workplaces
AuDHD is a common, legitimate disability-related presentation. Workplaces can improve performance and retention by adjusting job design, communication, and environment.
Common workplace impacts
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High capability with inconsistent output when under high interruption or unclear priorities;
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Fatigue and burnout from masking, open-plan sensory load, and social pressure;
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Difficulty with vague feedback; preference for direct, actionable guidance;
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Executive functioning barriers in admin-heavy roles without structure.
Reasonable adjustments
Communication and expectations
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Provide written instructions and clear priorities; confirm deadlines in writing.
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Break work into milestones; define deliverables and “done” criteria.
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Use direct feedback with specific examples; avoid indirect hints.
Workflow and environment
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Reduce interruptions; allow blocks of focus time.
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Offer quiet workspaces, noise control options, flexible seating, or remote/hybrid arrangements where possible.
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Limit unnecessary meetings; provide agendas in advance and actions afterwards.
Performance and support
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Align tasks to strengths; minimise context switching.
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Provide assistive tools (task boards, templates, automated reminders).
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Allow alternative ways to demonstrate competence (written updates rather than verbal; asynchronous communication).
Psychological safety
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Normalise accommodation requests; avoid stigma and “culture fit” bias.
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Train managers in neurodiversity-aware supervision.
Benefits to organisations
When supported appropriately, AuDHD employees often bring strengths such as deep domain expertise, rapid pattern detection, innovation, high integrity, and strong problem-solving under clear constraints.
Mental Health
Co-occurring autism and ADHD (AuDHD) is associated with a significantly elevated burden of mental health conditions when compared with neurotypical populations or individuals with only one diagnosis. These outcomes arise from intrinsic neurodevelopmental differences interacting with societal, environmental, and psychological stressors.
High prevalence of co-occurring mental health conditions
Research indicates that 50–70 % of autistic people experience at least one co-occurring psychiatric condition, including anxiety disorders, depression, post-traumatic stress disorder (PTSD), anorexia nervosa, and obsessive-compulsive disorder (OCD). These figures are drawn from large epidemiological and clinical studies and national health reviews. (Commonwealth 2022; Lai et al. 2014)
For ADHD, comorbidity rates with additional psychiatric disorders are also high. Approximately 70 % of adults with ADHD have at least one other mental health disorder, with anxiety and depressive disorders among the most common comorbidities; up to 50 % may experience anxiety disorders and substantial proportions experience depression. Co-occurring substance use disorders are also frequent in clinical samples.
Internalised distress and clinical presentations
People with AuDHD commonly internalise psychological distress. This internalisation can manifest as:
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Generalised and social anxiety
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Major depressive symptoms
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Somatic symptoms not attributable to a medical condition
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Self-harm behaviours and suicidality
These outcomes reflect an interplay of persistent stress, sensory overload, social challenges, and emotion regulation strain, which are more prevalent in neurodivergent populations.
Addiction risk and substance use
Emerging evidence suggests autistic individuals are at increased risk of developing substance use disorders (SUDs) and other addictive behaviours. Systematic reviews report substance use disorder prevalence in autistic samples ranging from approximately 1 % to 36 %, depending on sample characteristics and definitions. Autistic people without intellectual disability and those with co-occurring ADHD appear particularly vulnerable.
Population and survey data also indicate autistic adolescents and adults are over three times more likely than their peers to report using substances to manage stress, anxiety, or sensory overload, consistent with self-medication pathways. A subset of research further demonstrates elevated rates of heavy episodic drinking and dependence patterns relative to non-autistic controls.
Substance use in AuDHD may function as a coping strategy for:
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Social anxiety
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Sensory hyper-responsivity
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Emotion regulation difficulties
These factors can converge to increase both the likelihood of initial use and the transition to problematic use.
Summary
The mental health profile of individuals with AuDHD is characterised by:
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High rates of co-occurring psychiatric conditions, including mood, anxiety, trauma-related, obsessive-compulsive, and eating disorders.
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Elevated internalised distress, linked to anxiety, depression, self-harm, and suicidality.
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Increased vulnerability to addiction and substance use problems, often in the context of self-medication and overlapping risk factors.
These outcomes underscore the need for comprehensive, integrated assessment and intervention strategies that address neurodevelopmental differences and psychiatric comorbidity together, rather than in isolation.
Unemployment
Autism — labour force participation and unemployment
Data from the Australian Bureau of Statistics’ Autism in Australia, 2022 report shows that among Autistic Australians aged 15–64 years:
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50.2 % were participating in the labour force, compared with 60.5 % for all people with disability and 84.9 % for people without disability. This indicates substantially lower engagement with paid work or job seeking among autistic adults.
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42.2 % were employed, including 11.4 % in full-time roles and 29.8 % in part-time work.
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The unemployment rate for autistic people aged 15–64 was 18.2 %. This rate is more than double that of people with disability (7.5 %) and almost six times that of people without disability (3.1 %).
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Employment restrictions were common: three in four working-age autistic people had at least one restriction related to type of job, hours, need for time off, or requirement for supervision/assistance.
These figures reflect persistent barriers to entering and sustaining employment for autistic Australians, despite increases in workforce participation compared with earlier surveys.
ADHD — employment and labour force outcomes in Australia
Australia does not currently publish ADHD-specific labour force participation or unemployment rates in the same way as the ABS does for autism. However, research and economic analyses indicate substantial employment impacts associated with ADHD:
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ADHD affects a large proportion of the population (estimated at around 533,000 adults and 281,000 children/adolescents), and productivity losses associated with ADHD—largely driven by workforce participation challenges, absenteeism and reduced work performance—are a major cost component, estimated at over $10 billion annually.
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International studies consistently show that ADHD is associated with increased risk of employment instability, reduced job retention, higher rates of absenteeism, and lower lifetime earnings, even after controlling for sociodemographic factors. While these findings are from broader literature rather than ABS-specific data, they align with observed productivity costs attributed to ADHD in the Australian context.
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National inquiries and service reviews highlight persistent employment challenges for adults with ADHD related to organisation, attention, workplace demands, and lack of supports or accommodations, which can contribute to lower participation in stable employment compared with neurotypical peers.
Comparative context
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The unemployment rate for autistic working-age Australians (18.2 %) substantially exceeds general population rates (~4 %) and people with disability overall (7.5 %).
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For ADHD, while official unemployment figures specific to ADHD are not currently published in national ABS surveys, economic modelling and workforce analyses indicate that reduced labour force participation and workplace productivity losses are major contributors to the socioeconomic burden of the condition.
This data underscores the significant employment gaps experienced by neurodevelopmental populations in Australia and highlights the need for targeted workforce inclusion strategies, supported employment pathways, and workplace accommodations.
Economic impact of reduced workforce participation
ADHD unemployment and reduced workforce participation costs (Australia)
Deloitte Access Economics estimated the total social and economic cost of ADHD in Australia in 2019 at $20.42 billion; comprising $12.83 billion in financial costs and $7.59 billion in wellbeing losses.
Within the financial component, productivity impacts are dominant; Deloitte estimated productivity costs of $10.19 billion in 2019.
A key part of that productivity impact is reduced employment:
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Reduced employment associated with ADHD was estimated to cost $3.09 billion in 2019; $5,417 per working-age Australian with ADHD.
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This is Deloitte’s quantified “lost output” from lower workforce participation (reduced employment), separate from absenteeism and presenteeism.
What that means for the economy: fewer people working, and fewer hours worked, translates into lower national output (GDP), lower taxation revenue, and higher reliance on income support; Deloitte’s framework explicitly treats these as economy-wide productivity losses (and also estimates related “deadweight loss” from the tax system within broader costs).
Autism economic cost driven materially by employment impacts
The Senate Select Committee on Autism report (drawing heavily on the Synergies Economic Consulting cost study) cited an annual economic cost of autism in Australia of $8.1 billion to $11.2 billion (2010 dollars), with an average per person cost of $87,000.
The same section reports that, proportionally:
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employment costs represent 26% of total cost (with quality of life 40%; informal care for adults 22%).
From that, an employment-related cost can be inferred directly from the report’s percentages:
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Estimated annual employment cost of autism = 26% × ($8.1b to $11.2b)
= $2.11b to $2.91b per year (2010 dollars).
This is consistent with the report’s broader point; low employment and reduced independence drive substantial downstream fiscal impacts (welfare reliance; lost taxation revenue; increased service utilisation).
AuDHD extrapolation
Reduced workforce participation has a measurable national cost. Deloitte Access Economics estimated that reduced employment associated with ADHD cost Australia $3.81 billion ($3.09 billion in 2019). For autism, the Senate Select Committee on Autism report (citing Synergies Economic Consulting) reported an annual economic cost of $8.1–$11.2 billion (2010 dollars); with employment costs comprising 26% of the total, implying $2.1–$2.9 billion per year in employment-related impacts alone.
Using ABS estimates of 290,900 autistic Australians (2022) and international pooled prevalence indicating ~38.5% of autistic people also have ADHD, a cautious AuDHD extrapolation suggests an employment-related cost of ~$3.74–$5.25 billion per year in 2025 dollars (converted from the earlier 2010-dollar AuDHD range using the same CPI factor).