Written by Dr. Simon Khela MBChB MRCGP, GMC Registered Doctor
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A patient in his thirties came to see me 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 and fidget tools – never quite worked for him the way it seemed to for other people with the same diagnosis. His experience prompted a fuller assessment of whether both conditions might be relevant.
Stories like this help explain why the term AuDHD has become familiar, 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.
Quick answer: ADHD is a formal diagnosis involving persistent patterns of inattention and/or hyperactivity and impulsivity. AuDHD is an informal shorthand for a person who meets the diagnostic criteria for both ADHD and autism. The difference is the presence of autistic traits and criteria alongside ADHD, which may affect social communication, sensory experience and responses to change. A pattern of traits can suggest that both should be assessed; it cannot confirm either diagnosis on its own.
ADHD (attention deficit hyperactivity disorder) is a recognised neurodevelopmental condition. AuDHD is an informal term for having ADHD and autism together, a combination recognised in current clinical guidance. Rates of overlap vary by study and population, so one percentage would not describe everyone.
In practice, the comparison comes down to three points:
These traits may pull in different directions. Someone can need a familiar routine to feel calm yet find it understimulating. This can feel exhausting or contradictory, but the experience alone cannot tell us whether the person has ADHD, autism or both.
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, so a childhood diagnosis is not required before seeking an adult assessment. The NHS guide to ADHD in adults describes the signs and assessment pathway.
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 in the same person. Autism is a neurodevelopmental condition involving differences in social communication and interaction, alongside restricted or repetitive patterns of behaviour or interests. Sensory experiences and the need for predictability vary from person to person.
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.
The pattern is not always simply autism and ADHD symptoms added together. Traits can interact, sometimes making 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.
It is difficult to tell from a checklist. If you're asking “Do I have AuDHD or ADHD?”, consider these questions and bring specific examples to an assessment:
These notes help a clinician understand the whole picture, but none proves that you have either condition.
A person may recognise some of these experiences and have another explanation, or more than one. Anxiety, sleep problems and other conditions can overlap with neurodevelopmental traits. A specialist assessment considers those possibilities rather than treating a social media checklist as a diagnosis.
There's no single blood test, brain scan or definitive laboratory test for either ADHD or autism. Diagnosis involves a detailed clinical assessment, developmental history and review of how the traits affect daily life by appropriately trained clinicians. NICE ADHD guidance requires a full clinical and psychosocial assessment, not a questionnaire result alone.
The assessment looks at each condition in its own right:
Both conditions can be assessed through NHS or private pathways. The practical steps differ by provider and location:
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.
Support works best when it addresses the person's actual difficulties. Depending on their needs, examples include:
It can help to discuss reasonable adjustments with an employer or education provider. These are examples to adapt, not a standard plan for everyone with AuDHD.
Where ADHD medication is appropriate, it should be discussed and monitored with the prescribing specialist. It may help ADHD symptoms, but it is not a treatment for autism. If an approach seems to solve one difficulty while making another harder, tell the clinician so the plan can be adjusted.
Understanding whether ADHD, autism or both are contributing to someone's experience can be genuinely clarifying. It also helps to be realistic about what an assessment can and cannot change.
Potential benefits
Limitations to consider
I'd generally suggest considering a proper assessment if you recognise a consistent, longstanding pattern (not just occasional experiences) of:
If you are unsure which pathway is right, discuss the history with your NHS GP or book a private GP appointment, including an online GP consultation where appropriate. A GP can consider other explanations for the difficulties and discuss referral for an ADHD assessment, an autism assessment or both. Private Medical Clinic lists Mental Health assessments; check which pathway and fees fit your needs before booking.
AuDHD (often pronounced ‘aw-D-H-D’) informally means autism plus ADHD in the same person. It is a shorthand, not a separate formal diagnosis; the clinician assesses autism and ADHD against their respective criteria.
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 a coordinated assessment pathway.
Start by discussing both sets of concerns with your GP or an appropriately qualified assessment service. Ask how the ADHD and autism assessments are organised, who conducts them and how the findings are reported. The two conditions have their own diagnostic criteria; there is no single official “AuDHD test”.
Some women report sustained efforts to mask social differences, internal restlessness and exhaustion after apparently managing well at work or school. These experiences are not unique to women and do not diagnose either condition. A clinician should explore developmental history and impairment without relying on stereotypes.
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 by area and service and can change. Ask your GP or local service for the current pathway and estimate; a national figure would not accurately describe an individual referral.
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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