ADHD and Autism: Can You Have Both Conditions?

Yes, ADHD and autism can occur together. A person can meet the diagnostic criteria for both conditions, and having one does not rule out the other. Although ADHD and autism have some overlapping characteristics, they are distinct neurodevelopmental conditions with different diagnostic features.

Understanding how ADHD and autism can occur together is important because people do not always experience either condition in isolation. Someone may have difficulty maintaining attention, organising daily tasks and managing impulses while also experiencing sensory sensitivities, a preference for predictability or differences in social communication.

As a clinical psychologist, I often find that families and adults come to an assessment with questions that do not fit neatly into one category. They may recognise some characteristics of ADHD, some associated with autism, or a combination of both. Sometimes, they have spent years trying to understand why certain everyday situations feel more demanding than they seem to be for other people.

A careful assessment looks at the whole person rather than focusing on a single symptom or label. It can help explain their experiences, identify strengths and clarify what support may be useful.

What Are ADHD and Autism?

ADHD and autism are neurodevelopmental conditions. This means they relate to differences in development and functioning that begin during childhood, although they may not be recognised or diagnosed until later in life.

They can influence how someone processes information, interacts with others, manages everyday activities and responds to their environment.

What Is ADHD?

Attention-Deficit/Hyperactivity Disorder (ADHD) is characterised by persistent patterns of inattention and/or hyperactivity and impulsivity that affect everyday functioning.

ADHD can present in different ways.

Some people experience predominantly inattentive characteristics, such as:

• Difficulty sustaining attention.

• Forgetting appointments or instructions.

• Losing belongings.

• Struggling with organisation and planning.

• Finding it difficult to complete tasks.

• Becoming distracted by thoughts or external activity.

Others experience more hyperactive and impulsive characteristics, which may include:

• Feeling restless or needing to move.

• Talking frequently or interrupting.

• Finding it difficult to wait.

• Acting quickly without considering consequences.

• Experiencing internal restlessness.

Some people experience a combination of inattentive and hyperactive-impulsive characteristics.

ADHD is not simply a matter of being distracted or energetic. A diagnosis requires a broader pattern of symptoms, evidence of childhood onset and an impact on everyday functioning.

What Is Autism?

Autism, also referred to as Autism Spectrum Disorder (ASD), is a neurodevelopmental condition associated with differences in social communication and interaction, alongside restricted or repetitive patterns of behaviour, interests or activities.

Autistic people may experience characteristics such as:

• Differences in interpreting social cues or unspoken expectations.

• A preference for clear and direct communication.

• Strong or focused interests.

• A preference for routine and predictability.

• Repetitive movements or behaviours.

• Sensory sensitivities or differences in sensory processing.

Autism is a spectrum, meaning people have different combinations of characteristics and support needs. There is no single way to be autistic.

Some autistic people may need substantial everyday support, while others manage many responsibilities independently but experience difficulties in particular environments or situations.

Can ADHD and Autism Occur Together?

Yes. A person can be both autistic and have ADHD.

Historically, diagnostic approaches did not always allow both diagnoses to be given together. However, current diagnostic frameworks recognise that the two conditions can co-occur.

This matters because the characteristics of one condition do not necessarily explain everything a person experiences.

For example, someone may:

• Find it difficult to maintain attention during everyday tasks.

• Prefer predictable routines and become unsettled by unexpected changes.

• Have strong interests and spend considerable time focusing on them.

• Experience sensory discomfort in busy or noisy environments.

• Struggle with planning while also finding sudden changes difficult.

• Want social connection but find some social situations tiring or confusing.

These experiences may reflect a combination of ADHD and autistic characteristics.

One diagnosis should not be used to dismiss signs that may relate to the other. A comprehensive assessment considers the full developmental and behavioural picture.

Why Do ADHD and Autism Sometimes Look Similar?

One reason these conditions can be difficult to distinguish is that some of their characteristics overlap.

However, similar behaviours do not always have the same underlying explanation.

Attention and Concentration

People with ADHD may find it difficult to sustain attention, especially during tasks that are repetitive, less stimulating or require ongoing mental effort.

Autistic people may also experience differences in attention. They may focus deeply on particular interests or find it difficult to shift attention away from an activity.

For someone with both conditions, attention may vary depending on the task, environment and level of interest.

Social Communication

Some people with ADHD may interrupt conversations, miss details or respond impulsively. These behaviours can affect social interactions.

Autistic people may process social communication differently. They may interpret language more literally, prefer direct communication or find unspoken social expectations difficult to understand.

A person with both conditions may experience a combination of these differences.

Emotional Regulation

Emotional regulation can be challenging for some people with ADHD and autism.

A person may feel overwhelmed when plans change, when several demands occur at once or when they are dealing with a difficult social situation.

The reasons behind these experiences can vary. Understanding what contributes to emotional distress is more useful than assuming that every reaction has the same cause.

Sensory Experiences

Sensory differences are commonly associated with autism. These may involve heightened or reduced responses to sound, light, touch, taste, smell or movement.

Some people with ADHD also report sensory sensitivities or differences in how they respond to stimulation.

For someone with both conditions, a noisy classroom, busy workplace or crowded shopping centre may be particularly demanding.

Signs That Someone May Have Both ADHD and Autism

There is no single checklist that can confirm both conditions. However, certain combinations of experiences may indicate that further assessment would be helpful.

1. Difficulties With Organisation Alongside a Need for Routine

A person may find planning and organising everyday activities challenging while also feeling more comfortable when their routine remains predictable.

For example, they may struggle to remember appointments or manage time but become distressed when an unexpected change disrupts their plans.

These experiences can seem contradictory, but they may reflect different aspects of how the person processes information and manages daily demands.

2. Strong Interests Alongside Attention Difficulties

An individual may have a deep interest in particular subjects and spend long periods learning about them.

At the same time, they may find it difficult to complete routine activities, shift between tasks or maintain attention when something does not hold their interest.

3. Social Interest Alongside Social Communication Differences

Some autistic people enjoy friendships and social connection but find certain aspects of communication tiring or difficult to interpret.

ADHD-related impulsivity or distractibility may add another layer of difficulty.

It is important not to assume that someone who struggles socially does not want relationships. Their preferences and communication style may simply be different.

4. Sensory Sensitivities Alongside Restlessness

A person may feel uncomfortable in noisy or brightly lit environments while also experiencing restlessness or difficulty remaining focused.

Understanding the environmental demands that contribute to discomfort can help identify useful adjustments.

5. Difficulty Switching Tasks

Someone may struggle to move away from an activity they find engaging, or they may find unexpected transitions particularly challenging.

This can affect schoolwork, household routines, employment and relationships.

The reasons may differ between individuals, which is why a broader assessment is important.

Why Can It Take Time to Recognise Both Conditions?

For some people, one condition is recognised first, while characteristics of the other become clearer later.

This can happen for several reasons.

One Condition May Be More Noticeable

A child who is highly active or frequently distracted may initially be assessed for ADHD. If sensory differences, social communication characteristics or a strong need for predictability are also present, these may receive less attention at first.

Similarly, an autistic person may have their social communication and sensory differences recognised while ADHD-related difficulties with attention, planning or impulse control remain unexplored.

People Develop Ways to Manage Their Difficulties

Children and adults may develop strategies to manage situations they find challenging.

Some people use reminders, routines, preparation or support from family members to manage everyday responsibilities. Others may consciously observe and copy social behaviours to feel more comfortable in social situations.

These strategies can make some difficulties less obvious to other people, although they may require considerable effort.

Expectations Can Influence Recognition

Some children are identified because their behaviour is noticeably different from classroom expectations. Others may be quieter or less disruptive, meaning their difficulties receive less attention.

Adults may also reach an assessment later in life because they have managed their responsibilities for years without understanding why certain activities require so much effort.

One question I hear regularly is whether someone can be autistic if they are socially confident, or have ADHD if they can concentrate on activities they enjoy. The answer is that neither characteristic rules out a diagnosis. Individual experiences are more complex than common stereotypes suggest.

How Are ADHD and Autism Assessed Together?

When someone may have both conditions, a comprehensive assessment should consider each condition separately while also examining how their characteristics interact.

The assessment process depends on the person's age, developmental history and individual concerns.

Developmental History

The clinician explores early development, including childhood behaviour, communication, attention, play, routines and social experiences.

For children, parents or carers may provide important information. School observations and reports can also help build a clearer picture.

For adults, the clinician may ask about childhood experiences, education, friendships, family observations and long-standing patterns of behaviour.

Clinical Interviews

Clinical interviews help the clinician understand current concerns and how they affect everyday functioning.

Questions may explore:

• Attention and concentration.

• Organisation and time management.

• Social communication.

• Sensory experiences.

• Repetitive behaviours and interests.

• Emotional regulation.

• Flexibility and responses to change.

• Relationships, education and employment.

Standardised Assessment Tools

Depending on the assessment, the clinician may use standardised questionnaires, structured interviews and other recognised tools.

These help gather information about characteristics associated with ADHD and autism. However, no single questionnaire or test can independently establish both diagnoses.

The clinician needs to interpret the information alongside developmental history, clinical observations and functional impact.

Considering Other Explanations

Some characteristics associated with ADHD and autism can also occur alongside anxiety, depression, sleep difficulties, learning disorders and other developmental or mental health concerns.

A comprehensive assessment considers these possibilities rather than assuming that every difficulty is explained by ADHD or autism.

Feedback and Recommendations

Following the assessment, the clinician discusses the findings and explains whether the diagnostic criteria are met.

A written report may outline relevant characteristics, strengths, support needs and recommendations.

For children, this information may help parents and schools understand how to provide appropriate support. For adults, it may inform discussions about workplace adjustments, psychological support and everyday strategies.

What Does It Mean to Be Neuro-Affirming?

A neuro-affirming approach recognises that neurological differences are part of human diversity. It does not view every difference as something that needs to be corrected.

This approach also does not ignore genuine difficulties or support needs.

For someone with ADHD and autism, a neuro-affirming assessment considers both strengths and challenges.

For example, a person may have strong attention to detail, creativity or deep knowledge of particular subjects while also finding time management, sensory environments or unexpected changes difficult.

The aim is to understand the individual rather than compare them with a narrow idea of what is considered typical.

A useful assessment should help people understand:

• What they find easier or more challenging.

• Which environments support their wellbeing.

• What adjustments may reduce unnecessary stress.

• Which practical strategies suit their needs.

• Where additional professional support may be helpful.

What Support Can Help Someone With Both Conditions?

Support should be based on the person's individual needs rather than assuming that everyone with ADHD and autism requires the same approach.

Practical Support for Everyday Activities

Some people benefit from clear routines, visual reminders, written instructions and breaking larger tasks into manageable steps.

For example:

• Use calendars and reminders for appointments.

• Break complex activities into smaller tasks.

• Allow additional preparation time before transitions.

• Provide clear instructions rather than relying on implied expectations.

• Create quieter spaces where sensory demands can be reduced.

• Use predictable routines while allowing flexibility where possible.

The most useful strategies are those that fit naturally into the person's life.

Psychological Support

Psychological therapy may help address concerns such as anxiety, emotional distress, low self-esteem or relationship difficulties.

The approach should be adapted to the person's communication preferences, sensory needs and individual circumstances.

ADHD Coaching

Some people with ADHD benefit from structured support with organisation, prioritising, planning and time management. ADHD coaching may help individuals develop practical strategies for managing everyday responsibilities.

Where someone is also autistic, these strategies may need to account for sensory preferences, routines and the person's preferred way of working.

Support at School and Work

Children may benefit from adjustments that make classroom expectations clearer and reduce unnecessary sensory demands.

Adults may find written instructions, predictable communication, flexible working arrangements or a quieter workspace helpful, depending on their needs and workplace circumstances.

Support should be discussed collaboratively rather than based on assumptions about what a person can or cannot do.

When Should You Consider an Assessment?

You may wish to seek professional advice if attention, organisation, social communication, sensory experiences or responses to change are affecting everyday life.

For children, parents may notice difficulties across home and school settings. For adults, long-standing patterns may become more apparent when work, study or family responsibilities increase.

You do not need to be certain that someone has both conditions before asking for professional guidance.

A GP can be a useful starting point for discussing concerns and referral options. A psychologist with appropriate training and experience can help assess ADHD and autism within their professional scope.

If you are exploring an assessment in Melbourne, Brisbane or elsewhere in Australia, look for a clinician who can explain the assessment process, qualifications, fees and reporting arrangements clearly.

Understanding ADHD and Autism as Co-Occurring Conditions

ADHD and autism are distinct neurodevelopmental conditions, but they can occur together. Their overlapping characteristics can sometimes make it difficult to understand why someone experiences particular challenges.

A person may have difficulties with attention and organisation while also experiencing sensory differences, social communication differences or a strong preference for predictability.

Recognising both conditions can provide a more complete understanding of an individual's experiences. It can also help families, schools and workplaces consider support that reflects the person's actual needs.

If you are wondering whether your experiences or those of someone close to you may relate to both conditions, learning more about how you know you have ADHD may be a useful starting point for understanding ADHD-related characteristics. However, online information cannot replace a comprehensive professional assessment.

Ultimately, the aim is not simply to identify diagnostic labels. It is to understand the individual, recognise their strengths and identify practical ways to support their wellbeing and participation in everyday life.

Frequently Asked Questions

1. Can Someone Be Diagnosed With Both ADHD and Autism?

Yes. Current diagnostic frameworks recognise that ADHD and autism can occur together. A person can meet the diagnostic criteria for both conditions. An assessment should consider the characteristics of each condition separately and explore how they may interact in the person's everyday life.

2. What Are the Signs of Having Both ADHD and Autism?

Some people experience attention and organisation difficulties alongside sensory sensitivities, social communication differences, strong interests or a preference for predictable routines. However, these characteristics do not automatically mean someone has both conditions. A comprehensive assessment is needed to understand the person's developmental history and individual experiences.

3. Is ADHD Part of the Autism Spectrum?

No. ADHD and autism are separate neurodevelopmental conditions with different diagnostic criteria. However, they can co-occur, and some characteristics overlap. A person can be autistic without having ADHD, have ADHD without being autistic, or meet the criteria for both.

4. Can ADHD and Autism Be Diagnosed in Adults?

Yes. Adults can receive an ADHD and/or autism diagnosis. An assessment generally explores current experiences and developmental history, including evidence of relevant characteristics during childhood. Some adults seek assessment after recognising long-standing patterns that were not identified earlier in life.

5. Can a Child Have Both ADHD and Autism?

Yes. Children can meet the diagnostic criteria for both conditions. Assessment may involve information from parents, carers, teachers and other relevant professionals, alongside clinical interviews and standardised tools. Understanding both conditions can help identify appropriate educational, developmental and psychological support.

6. Are ADHD and Autism Treated in the Same Way?

Not necessarily. Support depends on the person's individual characteristics and needs. ADHD support may include practical strategies, coaching and medical treatment where appropriate. Autism support may focus on communication preferences, sensory needs, environmental adjustments and daily functioning. People with both conditions may benefit from a combination of approaches.

7. Does Having Both ADHD and Autism Mean Someone Needs More Support?

Not automatically. Support needs vary considerably between individuals. Some people manage many aspects of daily life independently, while others benefit from ongoing assistance in particular areas. A good assessment considers the person's strengths, challenges, environment and preferences rather than making assumptions based on diagnostic labels.

About the Author

Kerrin Danswan is the Founder and Clinical Psychologist at Cognitive Assessments Australia. With more than a decade of experience across private practice, government, and forensic psychology, she has extensive experience supporting children, adolescents, and adults through ADHD, autism, cognitive, and neuropsychological assessments, as well as evidence-based psychological therapy. Kerrin is passionate about neuro-affirming practice and helping people better understand how their minds work through compassionate, evidence-based care.