Written by Dr. Simon Khela MBChB MRCGP, GMC Registered Doctor
Last reviewed: 20-07-2026
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A patient in his thirties came to see me last year after his daughter was diagnosed with autism. Reading through her assessment report, he told me it felt uncomfortably like reading about himself, except he'd been diagnosed with ADHD a decade earlier and had never once considered that autism might be part of his picture too. He'd spent years wondering why standard ADHD advice, structure, routines, fidget tools, never quite worked for him the way it seemed to for other people with the same diagnosis. It turned out he had both.
This is one of the most common patterns I see in adult neurodevelopmental assessments now, and it's a large part of why the term AUDHD has spread so quickly, particularly online. It isn't an official diagnostic label you'll find in a medical textbook, but it describes something real: a growing recognition that ADHD and autism frequently occur together, and that the combination behaves differently from either condition alone.
This article sets out to explain, clearly and without hype, what AUDHD actually means, how it differs from ADHD on its own, what the overlapping and sometimes contradictory symptoms look like, and how diagnosis works in the UK.
ADHD (Attention Deficit Hyperactivity Disorder) is a recognised neurodevelopmental condition affecting attention, impulse control and, in some people, hyperactivity. AUDHD is not a formal clinical diagnosis. It's an informal term used to describe someone who has both ADHD and autism spectrum disorder at the same time, a combination that research suggests is common, with some studies estimating that a significant proportion of autistic people also meet the criteria for ADHD, and vice versa.
The key difference in practice is that ADHD alone tends to involve difficulty with attention regulation, impulsivity and, often, a need for stimulation and novelty. Autism alone tends to involve differences in social communication, a strong preference for routine and predictability, and sensory sensitivities. When both occur together, as in AUDHD, these traits can pull in opposite directions internally, for example, needing routine to feel calm (autism) while also finding routine boring and understimulating (ADHD), which is part of why people with both conditions often describe feeling unusually exhausted, contradictory, or hard to understand, even to themselves.
Diagnosis for both conditions in the UK typically involves a specialist assessment, either through the NHS or privately, and the two are assessed separately, even when someone is being evaluated for both at the same time.
ADHD is a neurodevelopmental condition, meaning it relates to differences in brain development and function, typically present from childhood, though it's increasingly recognised and diagnosed in adults who were missed earlier in life. It affects the brain's executive function systems, which govern attention regulation, impulse control, working memory, and, in some presentations, physical restlessness.
There are three recognised presentations:
Many patients are surprised to learn that ADHD doesn't always look like the stereotype of a hyperactive child bouncing off the walls. In adults, particularly women, it often presents as chronic disorganisation, emotional dysregulation, procrastination despite genuine effort, and a persistent sense of underachieving relative to one's actual ability, something ADHD UK and the NHS both describe as commonly overlooked presentations.
A question I'm frequently asked is why some children seem to "grow out of" ADHD. In reality, the hyperactive component often does become less visible with age, but the attention and impulse-control difficulties frequently persist into adulthood in a less physically obvious form, which is one reason ADHD in adults is so often missed until much later in life, sometimes only after a child's own diagnosis prompts a parent to reflect on their own history.
AUDHD describes the co-occurrence of ADHD and autism spectrum disorder in the same person. Autism itself is a neurodevelopmental condition affecting social communication, sensory processing, and behaviour, typically involving a strong preference for routine, predictability and specific interests, along with differences in how social interaction is experienced and processed.
Historically, UK diagnostic practice for many years discouraged diagnosing both conditions in the same person, partly due to older diagnostic criteria that treated them as mutually exclusive. This has since changed, and current NHS and NICE-informed practice recognises that the two conditions frequently co-occur, with research consistently showing meaningful overlap between autistic and ADHD populations.
What makes AUDHD clinically distinct isn't simply "autism plus ADHD symptoms added together". The two conditions interact, sometimes masking each other, sometimes amplifying each other, in ways that can make the presentation harder to recognise than either condition alone.
Many patients describe AUDHD as feeling like being pulled in two directions simultaneously. Some of the patterns I see most often include:
One of the most common concerns I see in practice is a patient who was diagnosed with ADHD years earlier, treated with standard ADHD strategies or medication, and found some but not full improvement, only to later recognise autistic traits that explain the parts of their experience that ADHD alone never quite accounted for.
There's no single blood test, brain scan or definitive laboratory test for either ADHD or autism. Diagnosis is based on a detailed clinical assessment, developmental history, and standardised diagnostic tools, carried out by a suitably qualified specialist.
For ADHD, this typically involves structured interviews and validated screening tools such as the Adult ADHD Self-Report Scale (ASRS), alongside a detailed history covering childhood behaviour, current functioning, and impact across multiple areas of life (work, relationships, daily functioning). A diagnosis isn't made from a screening tool score alone. These tools flag the likelihood of ADHD and guide further assessment; they don't replace a full clinical evaluation.
For autism, assessment usually includes structured diagnostic interviews such as the ADOS-2 or ADI-R, developmental history (including input from parents or family members where possible, particularly regarding childhood), and observation of social communication and behaviour.
Many patients search for an "ADHD test" or "AUDHD test" expecting something quick and definitive online. Free online questionnaires, including the ASRS or the Autism Spectrum Quotient (AQ-10), can be a genuinely useful starting point for deciding whether to seek a full assessment, and I'd encourage anyone who recognises a lot of themselves in this article to try one. But they are screening tools, not diagnoses, and a high score means "worth getting assessed properly", not "you definitely have this condition".
Diagnosis for both conditions in the UK can be pursued via the NHS or privately, and the practical realities of each pathway differ considerably.
On the NHS, adult ADHD and autism assessment waiting lists have grown substantially in recent years. In many parts of the UK, current waiting times for an adult ADHD assessment can extend to several years, and autism assessment waiting lists are often similarly lengthy, a situation acknowledged publicly by NHS England and reflected in NICE guidance on ADHD, which recommends timely assessment but doesn't control local service capacity.
Private assessment is considerably faster in most cases, typically weeks rather than years, though it comes at a cost that isn't accessible to everyone, and it's worth confirming that any private provider is appropriately regulated and that clinicians hold relevant specialist qualifications, since assessment quality varies between providers.
For someone being assessed for both conditions, most UK services, NHS and private, now assess them separately using condition-specific tools, sometimes within the same overall appointment structure, but the diagnostic criteria and process for autism and ADHD remain distinct even when co-occurring.
If a diagnosis is confirmed, specialist referrals and follow-up care, including consideration of ADHD medication where appropriate, ongoing psychological support, or workplace and educational adjustments, typically follow, guided by the specifics of the individual's presentation rather than a one-size-fits-all treatment plan.
AUDHD isn't a formal clinical diagnosis, but the co-occurrence it describes, ADHD and autism together, is a well-recognised and increasingly studied clinical reality, not a social media invention.
This was a widely held view under older diagnostic frameworks, but current understanding recognises significant overlap, and many people are formally diagnosed with both conditions.
Many patients are surprised to learn the opposite is often true. Recognising ADHD sometimes opens the door to identifying autistic traits that were previously masked, misattributed, or simply not considered.
Not necessarily. The combination often produces a distinct, sometimes contradictory pattern of traits rather than simply "more" of either condition.
Screening tools can indicate whether further assessment is worthwhile, but a proper diagnosis requires a full specialist evaluation, not a quiz result alone.
Understanding whether ADHD, autism, or both are contributing to someone's experience can be genuinely clarifying. Many patients describe a sense of relief at finally having an explanation for lifelong patterns they'd previously attributed to personal failing, laziness, or simply "being difficult". A formal diagnosis can also open access to reasonable adjustments at work or in education, appropriate treatment options, and more targeted psychological support.
That said, diagnosis isn't a complete solution on its own, and it's worth being realistic about this. Long NHS waiting times mean many people wait a considerable time for confirmation. Private assessment, while faster, isn't affordable for everyone. And a diagnosis doesn't automatically resolve day-to-day challenges. It provides a framework for understanding and accessing appropriate support, but ongoing strategies, and sometimes medication or therapy, are usually still needed alongside it.
I'd generally suggest considering a proper assessment if you recognise a consistent, longstanding pattern (not just occasional experiences) of:
A private GP appointment you can also opt for: online GP consultation, which is a reasonable first step if you're unsure which pathway is right for you, since a GP can discuss your history, rule out overlapping explanations, and guide an appropriate referral, whether that's for an ADHD assessment, an autism assessment, or both.
specialist, because an accurate diagnosis is what actually opens the door to support that helps.
AUDHD is an informal term describing someone who has both ADHD and autism spectrum disorder. It isn't a formal diagnostic label, but it's widely used to describe this common combination.
Yes. Current clinical understanding recognises significant overlap between the two conditions, and many people are diagnosed with both, sometimes at the same time and sometimes years apart.
Core symptoms include difficulty sustaining attention, impulsivity, restlessness (which in adults is often internal rather than physical), disorganisation, and emotional reactivity. Presentations vary between predominantly inattentive, predominantly hyperactive-impulsive, and combined type.
AUDHD symptoms often combine ADHD traits (impulsivity, attention difficulties, need for stimulation) with autistic traits (need for routine, sensory sensitivity, social communication differences), sometimes producing contradictory internal experiences, such as needing structure while also finding it understimulating.
Through a specialist assessment involving structured clinical interviews, standardised screening tools such as the ASRS, and a detailed developmental history, available via the NHS or private providers.
There's no single diagnosis for AUDHD itself. Instead, ADHD and autism are typically assessed separately, using condition-specific diagnostic tools, sometimes within the same overall assessment process.
Screening tools like the ASRS (for ADHD) and the AQ-10 (for autism) can indicate whether a full assessment is worth pursuing, but they aren't diagnostic on their own and shouldn't be treated as a confirmed result.
Waiting times vary significantly by region, but adult ADHD assessment waiting lists in many parts of the UK currently extend to a year or more, sometimes considerably longer.
Yes. It's increasingly common for adults to be diagnosed with either or both conditions for the first time, often after recognising traits in a child's diagnosis, or after years of unexplained difficulty that a formal assessment eventually clarifies.
Not necessarily worse, but often more complex, since traits from each condition can interact in ways that don't simply add together, sometimes masking, sometimes intensifying particular difficulties.
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