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Autism Spectrum Disorder (ASD) and ADHD

Many people wonder whether they have ADHD, autism, or both. As these neurodevelopmental conditions share similar symptoms, the ADHD and autism overlap is often misunderstood, something a structured assessment can help with for both adults and children, get clarity now:

ADHD Assessment

Our clinicians offer flexible assessment options to suit your schedule and preferences.
21%

Approximately 21% of children with ADHD are also autistic, with others having heightened autistic traits¹

28%
Around 28% of autistic children also meet criteria for ADHD²
3%
About 3% of adults have ADHD³

Is There a Link Between Autism Spectrum Disorder and ADHD?

While they are separate diagnoses, ADHD and Autism (ASD) frequently occur together with many people meeting the criteria for both, leading to the informal community term ‘AuDHD’.
Research suggests a significant number of autistic people also have ADHD⁴, and vice versa.

Both conditions begin in childhood and affect brain development, they often impact attention, executive function, and social life in similar ways. These overlapping symptoms can sometimes complicate a diagnosis, making a specialist assessment essential to untangle the two.

How Diagnosis Has Changed

Clinicians often use the DSM-5 diagnostic manual when assessing ADHD and autism. In the past, older versions of this manual actually prevented a dual diagnosis, making it very difficult to identify both together.

This changed when newer guidelines removed that restriction. If you have ever wondered, ‘can you be diagnosed with ADHD and autism’ at once, the answer is now a clear yes, which is why more people are now discovering they have a combination of both.

Autism Symptoms vs ADHD Symptoms

Symptoms vary significantly depending on a person’s age, gender, and environment. While the following patterns are common, online information cannot replace a professional assessment to understand your unique profile.
Note: While some symptoms overlap, Autism Symptoms and ADHD Symptoms often affect attention, behaviour and emotional responses in different ways.

Autism is primarily characterised by unique ways of communicating and experiencing the world. Many people find comfort in clear rules and predictable routines, often developing a deep, expert-level knowledge of specific interests.

Signs of autism in children:

  • Preference for a predictable daily routine and distress if it changes.
  • Intense focus on specific toys or technical subjects.
  • Differences in body language or avoiding eye contact.
  • Sensory sensitivities, such as being overwhelmed by loud noises.
  • Preferring to play alone or struggling to join in with peers.

Autism symptoms in adults:

  • Finding social communication or ‘small talk’ exhausting.
  • A strong need for consistency and a preference for clear, direct instructions.
  • Sensory overwhelm in busy environments like offices or supermarkets.
  • Deeply focused interests that provide a sense of joy and calm.
  • Feeling ‘out of step’ with social norms or unwritten rules.
ADHD often presents as a persistent difficulty with managing attention and regulating energy levels. It can make daily life feel like a constant battle with disorganisation and internal restlessness, often referred to as ‘time-blindness’.

ADHD symptoms in children:

  • Difficulty staying focused on schoolwork or play.
  • Fidgeting or a constant need to be ‘on the go’.
  • Acting impulsively or interrupting others during conversations.
  • Frequently losing toys, homework, or personal items.
  • Struggling to wait their turn in group activities.

ADHD symptoms in adults:

  • Challenges with planning and meeting work deadlines.
  • Forgetfulness in daily tasks like paying bills or keeping appointments.
  • Making impulsive decisions without considering long-term consequences.
  • Feeling internally restless even when sitting still.
  • Frequently talking over others or finishing their sentences.

How to know if it’s ADHD & Anxiety

Difficult concentrating can arise from ADHD, Anxiety or a combination of both.

ADHD

With ADHD, attention difficulties usually begin earlier in life and tend to affect multiple areas such as work, education, relationships or daily organisation.

Anxiety

With Anxiety, concentration often becomes harder during periods of worry, stress or perceived pressure, and may improve once anxiety levels reduce.
Symptom / Behavior
ADHD symptoms
Anxiety symptoms
difficulty concentrating or paying attention
trouble completing tasks
forgetfulness
distractedness
inability to relax or feelings of restlessness
fidgeting or difficulty sitting still
impatience, such as difficulty waiting or interrupting people
symptoms of panic such as rapid heart rate, rapid breathing, or sweating
difficulty listening to and following instructions
inability to focus for long periods of time
chronic feelings of worry or nervousness
fear without an obvious cause
irritability
trouble sleeping or insomnia
headaches and stomachaches
difficulty with executive function

becasue anxiety and ADHD influence attention in different ways, distinguihing between them often depends on understanding long term patterns rather than individual symptoms.

What anxiety can feel like

ADHD and anxiety rarely look like the “hyperactive child” stereotype in adults. Many people learn to hide the struggle by over-preparing, working late and using endless reminders, so from the outside they seem capable while feeling constantly behind inside.

When you also have anxiety or low mood, professionals can easily focus on those first and not ask about the lifelong pattern of focus, organisation and impulsivity. That’s why so many adults reach assessment feeling unseen and doubting themselves.

  • Constant worry and “what if?” thoughts
  • A sense of dread or something bad about to happen
  • Racing heart, tense muscles, upset stomach, shaking
  • Difficulty relaxing or getting to sleep
  • Difficulty switching off thoughts or relaxing mentally
  • Constant worry and “what if?” thoughts
  • A sense of dread or something bad about to happen
  • Racing heart, tense muscles, upset stomach, shaking
  • Difficulty relaxing or getting to sleep
  • Difficulty switching off thoughts or relaxing mentally

Support for Gut Health Problems and ADHD

Treatment plans for ADHD and anxiety are individual. Clinicians usually look at which symptoms are causing you most difficulty and may focus there first, or work on both together using a mix of medication and talking therapies.

Treatment options for ADHD

Support for ADHD can include stimulant or non-stimulant medication, psychoeducation, and practical strategies for organisation, time-management and planning.

Some people also benefit from coaching or CBT that is adapted to ADHD and focuses on building daily routines and managing impulsivity.

Treatment options for anxiety

Anxiety is commonly treated with psychological therapies such as cognitive behavioural therapy (CBT).

Where appropriate, a GP or mental health team may also offer medication such as SSRIs, alongside lifestyle support around sleep, stress and physical health.

Treatment options for ADHD

Some tools can ease both ADHD and anxiety at the same time, for example CBT, learning to break tasks into smaller steps, using structured planners, improving sleep, regular physical activity and reducing alcohol.

Following assessment, a clinician can explain which approaches may be most helpful and discuss appropriate next steps.

Daily life impact

In a world where creativity flows like a river, the sun rises over the hills, casting golden rays on the vibrant flowers.

ADHD and anxiety together can make everyday life feel like constant firefighting. At work or in your studies, that might look like missed deadlines, last-minute rushing, performance nerves and a nagging fear you’ll be “found out” as less capable. At home, lateness and forgetfulness can be read as not caring, which can lead to arguments or you pulling away because you feel overwhelmed.

Over time, many people start to feel they are always “under-achieving” despite how hard they try, and that can slide into burnout. Small changes will not replace assessment or treatment, but they can make daily life a bit easier – for example keeping one central to-do list, using clear visual reminders for key tasks, and breaking larger jobs into smaller, manageable steps.

Support for ADHD and anxiety

You do not need a GP referral to contact us for an ADHD assessment. If you prefer, you can still speak to your GP, who can check for other causes and explain local NHS options available to you.

ADHD assessment and clinical support

Support for ADHD can include stimulant or non-stimulant medication, psychoeducation, and practical strategies for organisation, time-management and planning.

  • Constant worry and “what if?” thoughts
  • A sense of dread or something bad about to happen
  • Racing heart, tense muscles, upset stomach, shaking
  • Difficulty relaxing or getting to sleep
  • Difficulty switching off thoughts or relaxing mentally
  • Constant worry and “what if?” thoughts
  • A sense of dread or something bad about to happen
  • Racing heart, tense muscles, upset stomach, shaking
  • Difficulty relaxing or getting to sleep
  • Difficulty switching off thoughts or relaxing mentally

Still unsure whether
ADHD or Anxiety may be affecting you?

Have Any Questions?

Got a question? Just reach out. We’ll get back to you as soon as we can, because your health matters, and we’re with you every step of the way.

Is it normal to have both ADHD and anxiety?

Yes. Many adults with ADHD also experience an anxiety disorder, so having both is common and means you may need support for two linked conditions, not just one.

Yes. Many adults with ADHD also experience an anxiety disorder, so having both is common and means you may need support for two linked conditions, not just one.
Yes. Many adults with ADHD also experience an anxiety disorder, so having both is common and means you may need support for two linked conditions, not just one.
Yes. Many adults with ADHD also experience an anxiety disorder, so having both is common and means you may need support for two linked conditions, not just one.

Yes. Many adults with ADHD also experience an anxiety disorder, so having both is common and means you may need support for two linked conditions, not just one.

Yes. Many adults with ADHD also experience an anxiety disorder, so having both is common and means you may need support for two linked conditions, not just one.
Yes. Many adults with ADHD also experience an anxiety disorder, so having both is common and means you may need support for two linked conditions, not just one.
If you require urgent assistance regarding your ADHD treatment outside of our opening hours, please follow the guidance below:


  • Non-Life-Threatening Situations: If your concern is urgent but not life-threatening, please contact your own GP for advice and support. If your GP Surgery is closed, you can also call the NHS non-emergency number, 111, for guidance on what to do next.
  • Life-Threatening Situations: If you or someone else is in immediate danger or experiencing a life-threatening emergency, please call 999 without delay.

Your safety and well-being are our top priorities, so please ensure you reach out to the appropriate services when in need.
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