ADHD or Autism? How to Tell the Difference

ADHD or autism is one of the most common questions families bring to assessment. A child might be overwhelmed at school, a teenager might be burning out, or an adult might be wondering why everyday life has always felt harder than it seems to for other people.

On the Sunshine Coast, we often meet families from Buderim, Maroochydore and surrounding areas who arrive with a strong hunch but no clear answer. They are not looking for a label for the sake of it. They are looking for clarity, direction and a better way to understand what has been happening.

ADHD and autism are different, but they can look similar from the outside. They can also occur together. That is why a professional assessment can be useful. It looks past the surface behaviour and asks what is driving it.

Table of Contents

• What ADHD Can Look Like
• What Autism Can Look Like
• Why ADHD or Autism Can Be Hard to Tell Apart
• Can Someone Have Both ADHD and Autism?
• How ADHD and Autism Look at Different Ages
• Masking and Burnout
• Why a Diagnosis Matters
• ADHD and Autism Assessment on the Sunshine Coast
• Frequently Asked Questions

What ADHD Can Look Like

ADHD is not simply a problem with “not paying attention”. Many people with ADHD can pay intense attention when something interests them. The harder part is directing attention when the task is boring, slow, repetitive or has no immediate reward.

For a parent-friendly Australian overview, the Raising Children Network has a useful guide to ADHD in children and teenagers.

For children, ADHD may look like trouble starting or finishing schoolwork, forgetting instructions, losing things, interrupting, rushing through tasks, having big emotional reactions, needing constant reminders or struggling to sit still and wait.

But ADHD is not always loud or obvious. Some children are not especially hyperactive. They may look dreamy, scattered, slow to get started or constantly overwhelmed. This is one reason many girls and quieter children are missed for years. They are not disrupting the room, so their difficulty is easier to overlook.

In adults, ADHD can show up as chronic disorganisation, procrastination, lateness, emotional intensity, unfinished tasks, forgetfulness or feeling like daily life takes far more effort than it should.

What Autism Can Look Like

Autism involves differences in social communication, sensory processing, routines, interests and the way a person makes sense of the world.

Autistic children and adults may notice details others miss. They may prefer direct communication. They may find social rules confusing or tiring. They may have strong interests, need predictability or be deeply affected by sounds, lights, textures, smells or busy environments.

The Raising Children Network also has a clear Australian guide to autism and autistic children.

Autism may look like finding social situations confusing, draining or unpredictable. It may involve strong reactions to changes in plans, intense interests that feel calming or important, sensory sensitivity, needing time alone after school or social demands, taking language literally or appearing “fine” in public and then falling apart at home.

Some autistic people are very socially motivated. They may want friendships badly, but still find the rules exhausting. Others may prefer smaller, quieter forms of connection. Autism does not look one way.

Why ADHD or Autism Can Be Hard to Tell Apart

This is where families often get stuck. ADHD and autism can both involve difficulty with planning, organisation, task switching, sensory sensitivity, emotional overwhelm, social difficulties, poor sleep and burnout.

The same behaviour can have different causes.

A child with ADHD might interrupt because the thought arrives quickly, and they struggle to hold it in. An autistic child might interrupt because the rhythm of conversation is hard to read.

A teenager with ADHD might avoid homework because starting feels impossible. An autistic teenager might avoid it because the task is unclear, the demand feels overwhelming or the school day has already used up everything they had.

From the outside, both children may look defiant, lazy or as though they are not trying. Underneath, the reasons can be very different.

That difference matters because the right support depends on the reason behind the behaviour.

Can Someone Have Both ADHD and Autism?

Yes. ADHD and autism often occur together. Some people use the term AuDHD to describe this combined profile.

AuDHD is not always as simple as “ADHD plus autism”. The two can interact in ways that feel confusing. A person may crave novelty but also need routine. They may want social connection but find it exhausting. They may be highly creative and quick-thinking, while also becoming overwhelmed by change, noise or uncertainty.

For these people, generic strategies often miss the mark. Too much routine can feel suffocating. Too much flexibility can feel chaotic. A good assessment helps map the person’s actual profile rather than forcing them into one neat category.

How ADHD and Autism Look at Different Ages

ADHD and autism can be missed or misunderstood because they do not look the same at every age. A child’s needs may become clearer only when the environment becomes more demanding.

Early Childhood and Prep

In younger children, ADHD may show up as constant movement, impulsive behaviour, difficulty waiting or trouble following more than one instruction at a time.

Autism may be seen in play, communication, sensory reactions, routines and how the child responds socially. Some children prefer playing beside others rather than with them. Some have very strong reactions to small changes. Others may have early language differences, unusual play patterns or intense interests.

On the Sunshine Coast, many families first notice concerns during the Prep year. A child who seemed settled at kindy may suddenly struggle in a classroom with more children, more noise, more sitting, more transitions and less flexibility.

That does not mean something suddenly went wrong. Often, the school environment simply makes the child’s needs more visible.

Primary School

Primary school tends to make ADHD easier to spot. The workload increases. Instructions get longer. Homework begins. Children are expected to organise belongings, remember routines and manage more of their own behaviour.

Autism may become more noticeable socially as friendships become more complex. A child who managed simple play in the early years may struggle with group dynamics, teasing, changing friendship rules or the social chaos of lunch breaks.

This is often the stage where families speak with their GP, school or paediatrician. A psychology assessment can help clarify what is happening and give schools more useful recommendations.

Teen Years, QCE and AARA

The teen years can hide ADHD and autism, especially in girls, high achievers and young people who have learned to mask.

Instead of obvious hyperactivity or social differences, the main signs may be anxiety, low mood, school refusal, irritability, exhaustion, perfectionism, shutdowns or burnout.

In Queensland, this can become especially important during the QCE years. If a diagnosis is made in Year 11 or 12, families may need documentation for AARA, which stands for Access Arrangements and Reasonable Adjustments.

For students in Year 11 or 12, a clear assessment can help the school understand whether the student needs Access Arrangements and Reasonable Adjustments for exams or assignments. The focus is usually on the functional impact: what gets in the way, how much it affects assessment, and what support would make the assessment fairer.

The earlier the pattern is understood, the easier it usually is to put the right supports in place.

Adulthood

Many adults seek ADHD or autism assessment after years of feeling overwhelmed, different or exhausted. Some come after a child’s diagnosis. Others come after burnout, a job change, study difficulties, relationship stress or becoming a parent.

Adult ADHD and autism are often less visible from the outside. The person may have a job, a family and responsibilities, but feel like they are holding everything together with enormous effort.

For some adults, diagnosis brings grief for what was missed. For many, it also brings relief. Things that once looked like personal failure start to make sense.

Masking and Burnout

Masking means working hard to appear more settled, organised, socially comfortable or “normal” than you actually feel.

Autistic masking might involve rehearsing conversations, copying other people’s expressions, forcing eye contact, hiding sensory distress or suppressing natural movements and self-soothing behaviours.

ADHD masking might involve over-preparing, using elaborate reminder systems, pretending to follow a conversation after attention has drifted or putting huge effort into looking organised.

Masking can be useful in the short term, but it is tiring. Over time, it can contribute to anxiety, depression, shame and burnout. This is why some children and adults seem to cope for years, then suddenly cannot.

The mask did not mean they were fine. It meant they were working very hard.

Why a Diagnosis Matters

A diagnosis is not just a label. For many people, it changes the story they have been telling themselves.

Children who struggle without knowing why often come up with painful explanations. They may think they are dumb, lazy, too much, weird or unlikable.

Adults can do the same thing. They may believe they should be able to manage better, that everyone else is coping, or that they simply need to try harder.

Over time, those explanations wear people down.

A good diagnosis gives a more accurate explanation. It does not remove every difficulty, but it can reduce shame. It can help families respond with more patience and precision. It can help schools understand what support is needed. It can help adults stop blaming themselves for problems that were never about character.

The child who was seen as disruptive may be a child with ADHD who needs support with regulation and task initiation. The rude child may be an autistic child who communicates directly and misses hidden social rules. The lazy teenager may be a young person using all their energy just to get through the day.

Same person. Better explanation.

ADHD and Autism Assessment on the Sunshine Coast

Bear in Mind Psychology provides ADHD and autism assessments for children, teenagers and adults across the Sunshine Coast, including Buderim, Maroochydore and surrounding areas.

Some people come to us wondering about ADHD. Others are wondering about autism. Many are asking whether it could be both. Sometimes the assessment points somewhere else entirely, such as anxiety, learning differences, sleep issues, trauma, giftedness or a combination of factors.

When autism is part of the question, a formal autism assessment and diagnosis can be helpful because it looks at the broader developmental pattern, not just one behaviour or symptom on its own.

The goal is not to force a label. The goal is to understand the pattern properly, explain what is happening and identify the supports that are most likely to help at home, school, work or in daily life.

For children and teenagers, an assessment may help families and schools plan more useful supports. For senior students in Queensland, assessment information may also support conversations about AARA, depending on the student’s functional needs and school process.

For adults, assessment can help explain long-standing patterns with attention, organisation, sensory overwhelm, burnout, relationships or emotional regulation.

If you are wondering whether ADHD, autism or both may explain what you or your child has been experiencing, an assessment can help make sense of the pattern and guide the next steps.

Frequently Asked Questions

Is it ADHD or autism?

It can be hard to tell without an assessment because ADHD and autism can look similar from the outside. Both can affect emotions, social connection, sensory regulation, school, work and daily routines. The difference is usually in what is driving the behaviour.

Can someone have both ADHD and autism?

Yes. Some children, teenagers and adults meet criteria for both ADHD and autism. This is sometimes called AuDHD. A combined profile can involve both a need for routine and a need for novelty, which can feel confusing for the person and the people around them.

Can a child do well at school and still have ADHD or autism?

Yes. Some children do well academically but struggle socially, emotionally or with exhaustion. Others hold everything together at school and then fall apart at home. Good grades do not rule out ADHD or autism.

When should we consider an assessment?

An assessment may be worth considering if difficulties with attention, organisation, sensory overwhelm, social understanding, emotional regulation, school refusal or burnout are affecting daily life. It can help clarify whether the pattern fits ADHD, autism, both or something else.

Does Bear in Mind Psychology offer ADHD and autism assessment on the Sunshine Coast?

Yes. Bear in Mind Psychology offers ADHD and autism assessments for children, teenagers and adults across the Sunshine Coast, including Buderim, Maroochydore and nearby areas.

Ready to Take the Next Step?

If you are considering an ADHD or autism assessment for yourself or your child, you can complete Bear in Mind Psychology’s new client form. We will review the information and follow up when an appointment becomes available.