AuDHD

Living with both autism and ADHD — how they interact, why one often masks the other, and what it means for assessment and support

What is AuDHD?

AuDHD is the informal but widely used term for a person who has both autism and ADHD. It is not a separate clinical diagnosis; it simply describes having both conditions simultaneously. The term has gained traction in neurodivergent communities because it captures something that clinical language does not always reflect well: that living with both is not simply the sum of two separate experiences, but something distinct.

Research consistently shows that autism and ADHD co-occur at high rates. Estimates vary, but studies suggest that around 50–70% of autistic people also meet criteria for ADHD, and that 20–50% of people with ADHD show significant autistic traits. Many clinicians now treat co-occurrence as the rule rather than the exception.

Despite this, clinical practice has historically assessed and treated them separately, often missing one entirely because the other was more visible.

How autism and ADHD interact

Autism and ADHD share some surface features but arise from different underlying mechanisms. When both are present, they can interact in ways that make life both more complex and more confusing for the people experiencing it, and for the clinicians assessing them.

They can mask each other. ADHD's impulsivity and drive for novelty can obscure autistic rigidity and the need for routine. Autistic structure and rule-following can compensate for ADHD disorganisation, making the ADHD look less severe than it is. Either condition can make the other harder to see.

They can create contradictory drives. ADHD pushes towards novelty, variety, and stimulation. Autism often creates a strong need for predictability, routine, and sameness. For AuDHD people, these competing needs can create a constant internal tension: craving change but finding it destabilising; needing routine but becoming bored and restless within it.

Social processing is particularly affected. ADHD affects the ability to regulate attention and impulse in social situations. Autism affects how social cues are read and processed. Together, they can make social interaction cognitively exhausting in ways that neither condition alone fully explains.

Sensory and emotional regulation overlap. Both autism and ADHD affect emotional regulation, though through different mechanisms. Rejection sensitive dysphoria (strongly associated with ADHD) and autistic emotional responses can amplify each other. Sensory sensitivities associated with autism may be more difficult to manage when ADHD also affects the ability to regulate responses.

Why one condition often gets missed

When only one diagnosis is made, it is usually ADHD, because ADHD tends to be more visible in clinical settings, particularly in childhood, while autistic masking can be highly effective until it breaks down.

The reverse is less common but also happens: in girls and women, where autistic traits are more visible than ADHD traits, an autism diagnosis is sometimes made while ADHD goes unrecognised for years.

Common scenarios:

  • ADHD diagnosed in childhood, autism missed: The ADHD was visible; the autistic masking was effective. The autism may only become apparent in adulthood when masking becomes unsustainable.
  • Autism diagnosed, ADHD missed: Attention difficulties were attributed to autism. The separate ADHD mechanism was not explored.
  • Both missed entirely: Neither condition was recognised because each masked the other, or because the person was female, high-achieving, or from a background where neurodevelopmental conditions were rarely identified.
  • One condition diagnosed in adulthood, then the second: A late autism diagnosis prompts recognition of ADHD, or vice versa.

Why assessment order matters

For people seeking assessment for both conditions, the order matters. Assessing for both simultaneously (if the assessing clinician has the skills to do so) is generally preferable to two separate sequential assessments.

If assessed separately, autism should ideally be assessed before or alongside ADHD, because unrecognised autism can significantly affect how ADHD presents and what treatment looks like. An autism diagnosis also changes the clinical picture for ADHD: it affects medication decisions, what psychological support is appropriate, and how results from ADHD screening tools should be interpreted.

When choosing a private provider, ask specifically whether they have experience assessing for both conditions concurrently, and whether their diagnostic report will address potential co-occurrence explicitly.

Our Compare providers tool shows which providers offer combined ADHD and autism assessments.

What it means for medication

ADHD medication (stimulants and non-stimulants) can be prescribed to AuDHD people and is often effective. However, some autistic people experience stimulant medication differently, for example anxiety, which is already more prevalent in autistic people, may be exacerbated by stimulants in some cases.

This does not mean medication is wrong or should be avoided. It means the decision should be made with a prescribing clinician who is aware of both diagnoses and the ways they interact. Non-stimulant options such as atomoxetine may suit some AuDHD people better.

The monitoring process (regular check-ins, blood pressure, appetite, mood) remains the same. See our medications page for Scotland-specific prescribing information.

What support looks like

Support for AuDHD people tends to be most effective when it addresses both conditions explicitly, rather than treating each in isolation. In practice, this means:

  • ADHD medication managed by a prescriber who understands the autism context
  • Psychological support (CBT, coaching, occupational therapy) adapted for both conditions
  • Workplace or educational adjustments that account for sensory needs, communication preferences, executive function difficulties, and the need for predictability
  • Community connection: many AuDHD people find peer communities of people with similar profiles more helpful than generic neurodivergent or single-condition support

Useful organisations

ADHD Scotland — Scotland's ADHD charity; many people on their books are also autistic.

Scottish Autism — Scotland's leading autism charity; increasingly aware of co-occurrence.

ADHD UK — UK-wide charity with accessible information and community support; covers AuDHD experiences.

National Autistic Society Scotland — helplines, information, and campaigns.

Trusted further reading

ADHD Scot is an independent, non-clinical information project. Nothing here is medical advice. Always speak to a qualified clinician about your own health, assessment, and treatment options.