ADHD and Autism Together

ADHD and Autism Together

ADHD and autism are different conditions. A person may have ADHD without being autistic, be autistic without having ADHD, or meet the diagnostic criteria for both conditions. When both are present, many people use the informal community term AuDHD to describe this combination.

ADHD and autism are different conditions. A person may have ADHD without being autistic, be autistic without having ADHD, or meet the diagnostic criteria for both conditions. When both are present, many people use the informal community term AuDHD to describe this combination.

ADHD and autism are different conditions. A person may have ADHD without being autistic, be autistic without having ADHD, or meet the diagnostic criteria for both conditions. When both are present, many people use the informal community term AuDHD to describe this combination.

AuDHD is not a separate clinical diagnosis and does not replace either an ADHD or an autism diagnosis.

AuDHD is not a separate clinical diagnosis and does not replace either an ADHD or an autism diagnosis.

AuDHD is not a separate clinical diagnosis and does not replace either an ADHD or an autism diagnosis.

Content reviewed by

Psychologist & Behaviour Analyst

ADHD and autism together: what you need to know
ADHD and autism are distinct neurodevelopmental conditions, but they can occur in the same person.
Some experiences may appear similar from the outside, while the processes behind them and the support needed may differ.
A screening test cannot diagnose ADHD or autism. A comprehensive assessment considers developmental history, everyday functioning and other possible explanations.

How common is AuDHD?

How common is AuDHD?

How common is AuDHD?

ADHD and autism occur together relatively often. A 2021 review combined the findings of 63 studies. It found that approximately four in ten autistic participants also met the diagnostic criteria for ADHD. Autism-related features may also be more common among people with ADHD, but having these features is not the same as receiving an autism diagnosis. There is no single figure that applies to everyone. Studies have included people of different ages and backgrounds, and the settings and methods used have also varied.



What do AuDHD prevalence estimates mean?
A screening score is not the same as a confirmed diagnosis.
An estimate from one study may not apply equally to every group of people.
ADHD does not automatically mean that autism is present, nor does autism alone mean that ADHD is present.

How can ADHD and autism appear similar or different?

How can ADHD and autism appear similar or different?

How can ADHD and autism appear similar or different?

ADHD and autism are not the same, although some of their features may appear similar. An autistic person may enjoy new experiences, and a person with ADHD may rely heavily on routines.

The following table shows possible patterns rather than diagnostic rules.

How ADHD and autism may differ

How ADHD and autism may differ

How ADHD and autism may differ

Area

Area

How ADHD and autism may differ

When both are present

Executive functioning

Executive functioning

Executive functioning

ADHD: Creating and maintaining systems can be difficult. Autism: Clear structure and familiar sequences can help.

ADHD: Creating and maintaining systems can be difficult. Autism: Clear structure and familiar sequences can help.

Structure may be needed, while following it remains difficult.

Structure may be needed, while following it remains difficult.

Structure may be needed, while following it remains difficult.

Transitions and change

Transitions and change

Transitions and change

ADHD: Shifting attention and changing tasks can be difficult. Autism: Disruption to familiar routines can be distressing.

ADHD: Shifting attention and changing tasks can be difficult. Autism: Disruption to familiar routines can be distressing.

ADHD: Shifting attention and changing tasks can be difficult. Autism: Disruption to familiar routines can be distressing.

Both variety and predictable change may be needed.

Both variety and predictable change may be needed.

Both variety and predictable change may be needed.

Sensory environment

Sensory environment

Sensory environment

ADHD: Competing stimuli can distract or divide attention. Autism: The stimulus itself can feel unusually intense or uncomfortable.

ADHD: Competing stimuli can distract or divide attention. Autism: The stimulus itself can feel unusually intense or uncomfortable.

ADHD: Competing stimuli can distract or divide attention. Autism: The stimulus itself can feel unusually intense or uncomfortable.

The environment may affect attention and sensory processing at the same time.

The environment may affect attention and sensory processing at the same time.

The environment may affect attention and sensory processing at the same time.

Social situations

Social situations

Social situations

ADHD: Drifting attention or impulsive responses can disrupt conversation. Autism: Indirect cues and unspoken rules can be difficult to interpret.

ADHD: Drifting attention or impulsive responses can disrupt conversation. Autism: Indirect cues and unspoken rules can be difficult to interpret.

ADHD: Drifting attention or impulsive responses can disrupt conversation. Autism: Indirect cues and unspoken rules can be difficult to interpret.

Following and interpreting conversation may both require considerable effort.

Following and interpreting conversation may both require considerable effort.

Following and interpreting conversation may both require considerable effort.

Interests and engagement

Interests and engagement

Interests and engagement

ADHD: Novelty can quickly capture attention, which may later fade. Autism: Focused interests can provide lasting enjoyment and predictability.

ADHD: Novelty can quickly capture attention, which may later fade. Autism: Focused interests can provide lasting enjoyment and predictability.

ADHD: Novelty can quickly capture attention, which may later fade. Autism: Focused interests can provide lasting enjoyment and predictability.

Intense interests may alternate between new and familiar topics.

Intense interests may alternate between new and familiar topics.

Intense interests may alternate between new and familiar topics.

Two similar behaviours do not always have the same underlying explanation. Stress, lack of sleep, anxiety, physical health and the surrounding environment can also influence how these difficulties appear.

ADHD symptoms →

Two similar behaviours do not always have the same underlying explanation. Stress, lack of sleep, anxiety, physical health and the surrounding environment can also influence how these difficulties appear.

ADHD symptoms →

Why can balance be difficult with AuDHD?

Why can balance be difficult with AuDHD?

Why can balance be difficult with AuDHD?

When someone has both ADHD and autism, they may need things that appear contradictory. They may rely on predictable plans while finding it difficult to maintain their own routines. They may seek variety but become overwhelmed when a plan changes without warning. This is not deliberate inconsistency. When the two sets of processes are active, attentional and sensory demands may become difficult to manage at the same time. It is important to identify what genuinely helps the individual and what can remain workable over time.

How does an ADHD assessment work? →

When someone has both ADHD and autism, they may need things that appear contradictory. They may rely on predictable plans while finding it difficult to maintain their own routines. They may seek variety but become overwhelmed when a plan changes without warning. This is not deliberate inconsistency. When the two sets of processes are active, attentional and sensory demands may become difficult to manage at the same time. It is important to identify what genuinely helps the individual and what can remain workable over time.

How does an ADHD assessment work? →

Why can AuDHD be difficult to recognise?

Why can AuDHD be difficult to recognise?

Why can AuDHD be difficult to recognise?

Some people hide their reactions, rehearse conversations in advance, copy other people’s social behaviour or constantly monitor the impression they are making. From the outside, they may appear organised, sociable, adaptable or successful. What is less visible is how much effort this requires, how exhausting it can be and what support they may need. People may assume for a long time that everyone finds the same situations equally difficult. Because this has always been their experience, they may blame themselves rather than recognise that their needs differ from those of other people. They may believe they are simply not trying hard enough.

The examples below show what may remain hidden behind visible functioning.

✗ “They are organised, so they cannot have ADHD.”

Their organisation may depend on calendars, reminders, lists, fixed places for belongings and repeated checking. If this system is disrupted, tasks or appointments may easily be forgotten.

✗ “They are sociable, so they cannot be autistic.”

They may enjoy spending time with other people while finding it difficult to follow group conversations or interpret unspoken social expectations. They may need an extended period of rest afterwards.

✗ “They are quiet or withdrawn, so they are not interested in other people.”

They may want social connection, but noise, lighting, smells, several people speaking at once or the attentional demands of responding may become overwhelming. Withdrawing may help them recover and regulate.

✗ “They are simply fussy about clothing.”

Labels, seams, synthetic materials, scratchy jumpers, tight collars or scarves touching the neck may feel intensely uncomfortable. They may therefore choose the same comfortable clothes repeatedly or wear garments inside out.

✗ “Strong smells and noise bother everyone.”

They do not affect everyone to the same degree. For some people, noise, bright light or strong smells may become so intense that it is difficult to concentrate, speak or make decisions.

✗ “They rely on routines, so they must be good at following them.”

They may need routines to feel safe and prepared. This does not mean they can follow them consistently every day, particularly when the routine becomes repetitive or unstimulating.

✗ “They perform well, so they do not need support.”

Achieving a good result may require considerably more time, checking and energy. They may appear successful from the outside while feeling completely exhausted afterwards.

✗ “A habit like this must mean ADHD or autism.”

A diagnosis cannot be made from one habit. The broader developmental and functional pattern matters.

Masking, compensation or exhaustion do not, by themselves, confirm ADHD or autism. Sometimes, every difficulty is attributed to whichever condition was recognised first. An assessment should also consider how much effort is required to maintain this outward level of functioning.

ADHD in women →

Some people hide their reactions, rehearse conversations in advance, copy other people’s social behaviour or constantly monitor the impression they are making. From the outside, they may appear organised, sociable, adaptable or successful. What is less visible is how much effort this requires, how exhausting it can be and what support they may need. People may assume for a long time that everyone finds the same situations equally difficult. Because this has always been their experience, they may blame themselves rather than recognise that their needs differ from those of other people. They may believe they are simply not trying hard enough.

The examples below show what may remain hidden behind visible functioning.

✗ “They are organised, so they cannot have ADHD.”

Their organisation may depend on calendars, reminders, lists, fixed places for belongings and repeated checking. If this system is disrupted, tasks or appointments may easily be forgotten.

✗ “They are sociable, so they cannot be autistic.”

They may enjoy spending time with other people while finding it difficult to follow group conversations or interpret unspoken social expectations. They may need an extended period of rest afterwards.

✗ “They are quiet or withdrawn, so they are not interested in other people.”

They may want social connection, but noise, lighting, smells, several people speaking at once or the attentional demands of responding may become overwhelming. Withdrawing may help them recover and regulate.

✗ “They are simply fussy about clothing.”

Labels, seams, synthetic materials, scratchy jumpers, tight collars or scarves touching the neck may feel intensely uncomfortable. They may therefore choose the same comfortable clothes repeatedly or wear garments inside out.

✗ “Strong smells and noise bother everyone.”

They do not affect everyone to the same degree. For some people, noise, bright light or strong smells may become so intense that it is difficult to concentrate, speak or make decisions.

✗ “They rely on routines, so they must be good at following them.”

They may need routines to feel safe and prepared. This does not mean they can follow them consistently every day, particularly when the routine becomes repetitive or unstimulating.

✗ “They perform well, so they do not need support.”

Achieving a good result may require considerably more time, checking and energy. They may appear successful from the outside while feeling completely exhausted afterwards.

✗ “A habit like this must mean ADHD or autism.”

A diagnosis cannot be made from one habit. The broader developmental and functional pattern matters.

Masking, compensation or exhaustion do not, by themselves, confirm ADHD or autism. Sometimes, every difficulty is attributed to whichever condition was recognised first. An assessment should also consider how much effort is required to maintain this outward level of functioning.

ADHD in women →

When may further assessment be worth considering?

When may further assessment be worth considering?

When may further assessment be worth considering?

Further assessment may be helpful if:

  • you already have an ADHD or autism diagnosis, but it does not explain all of your experiences;

  • ADHD-related difficulties have been present since childhood;

  • autism-related features have also been present over time;

  • both sets of needs appear together;

  • these patterns occur across different areas of life;

  • maintaining everyday functioning requires considerable energy.

You do not need to decide in advance which diagnosis is “correct”. The purpose of assessment is to understand the full picture, not to confirm a conclusion chosen beforehand.


What should an assessment clarify?

A thorough assessment considers both what a person does and what may be contributing to it. The clinician explores:

  • How does the person experience the situation?

  • How long have these experiences been present?

  • In which situations do they occur?

  • What makes them more or less noticeable?

  • How do they affect everyday life and wellbeing?

The assessment helps clarify whether ADHD, autism, both conditions or another explanation best accounts for the difficulties.

How does an ADHD assessment work? →

What support may help with AuDHD?

What support may help with AuDHD?

What support may help with AuDHD?

The purpose of support is to make everyday life more manageable, not to hide signs of ADHD or autism. People with AuDHD may need predictability and flexibility at the same time. Advance notice can be important, while choice and variety may also help. A rigid schedule can provide a sense of safety yet remain difficult to follow over time. Too much variety may feel interesting at first but can also become overwhelming. The most helpful approach will differ from person to person.

What can a screener tell you?

A brief ADHD screener may indicate whether an ADHD assessment could be worth considering. It does not provide a diagnosis, rule out ADHD or show whether someone is autistic. If autism-related features are also present, a separate autism assessment may be helpful. An ADHD assessment alone does not provide an autism diagnosis.

How to book an ADHD assessment →

The purpose of support is to make everyday life more manageable, not to hide signs of ADHD or autism. People with AuDHD may need predictability and flexibility at the same time. Advance notice can be important, while choice and variety may also help. A rigid schedule can provide a sense of safety yet remain difficult to follow over time. Too much variety may feel interesting at first but can also become overwhelming. The most helpful approach will differ from person to person.

What can a screener tell you?

A brief ADHD screener may indicate whether an ADHD assessment could be worth considering. It does not provide a diagnosis, rule out ADHD or show whether someone is autistic. If autism-related features are also present, a separate autism assessment may be helpful. An ADHD assessment alone does not provide an autism diagnosis.

How to book an ADHD assessment →

Not sure where to start?

Not sure where to start?

Not sure where to start?

Our free five-minute ADHD screener may provide a useful indication and some preliminary information. A screener is not a diagnosis and cannot replace consultation with a suitably qualified health professional.

Ready to learn more about ADHD assessment?
Connect with a suitably qualified health professional who can help you explore what may be contributing to your experiences and whether a full ADHD assessment could be helpful.
Types of ADHD: how can they look different?

Not sure how the different ADHD presentations may appear in everyday life? Learn more about types of ADHD, how they vary between people, and when further assessment may be worth considering.

Types of ADHD →

This page provides general information only.
It cannot determine whether you have ADHD and it does not replace a full assessment by a suitably qualified health professional with training and experience in ADHD.

Sources

Sources

About ADHD

Assessments & Treatment

About Us