ADHD Symptoms in Children

Q: Do I need a GP referral to get my child assessed privately?

No. ADHD Certify is a private specialist clinic. You can book a child assessment directly without a GP referral. Our clinicians are experienced in assessing ADHD in children and will gather information from you, your child, and where relevant, their school.

Q: How is a child ADHD assessment different from an adult one?

A child assessment involves gathering information from parents and teachers as well as the child themselves. Standardised rating scales are completed by both parents and school staff. The clinical interview considers developmental history from early childhood, alongside current presentation. The assessment is designed to build a picture of the child across different settings and contexts.

If your child is struggling to concentrate, behaving impulsively, or finding school far harder than it should be, ADHD may be part of the picture. This guide explains what ADHD looks like in children, why it often goes unrecognised, and how to access an assessment if you are concerned.

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What is ADHD ?

ADHD (attention deficit hyperactivity disorder) is a neurodevelopmental condition affecting how the brain regulates attention, impulse control, and activity levels. It is not a failure of willpower or intelligence. NICE estimates that 3 to 4 percent of adults in the UK have ADHD.^¹ As of May 2025, NHS England estimates 2.5 million people in England are living with ADHD, the majority without a formal diagnosis.²

What does ADHD look like in children?

ADHD in children does not always look like a child who cannot sit still. That is one version of it. But ADHD also looks like the child who sits quietly and stares out of the window, unable to follow what the teacher is saying. It looks like the child who is always last to finish their work, not because they are not trying, but because their brain keeps pulling their attention somewhere else.

DSM-5 identifies three presentations of ADHD: predominantly inattentive, predominantly hyperactive-impulsive type ADHD, and combined type. ³ In children, combined type ADHD is the most commonly diagnosed. But inattentive type ADHD is frequently missed, particularly in girls, because it does not cause disruption. ⁴

ADHD symptoms must be present in more than one setting, for example both at home and at school, and must have persisted for at least six months. What a child looks like in the classroom and what they look like at home can be very different, which is why a thorough assessment gathers information from multiple sources.

5%

of school-age children in the UK estimated to have ADHD, roughly 1 to 2 per classroom1 ¹

744,000

children and young people aged 5 to 24 estimated to have ADHD in England ²

2-3 yrs

average CAMHS wait for a child ADHD assessment in England5

The three types of ADHD and their symptoms in children

ADHD symptoms in children fall into three clusters. Many children experience symptoms across more than one, and the way symptoms show up can vary depending on the setting, the task, and the child’s age.

Attention and focus (inattentive type ADHD)

e.g. Staring at the same page of a book for 20 minutes without taking in a word

e.g. Looking at you but seeming to be elsewhere, not ignoring you but genuinely not registering what was said

e.g. Being told to get dressed, have breakfast, and brush teeth, and making it as far as getting dressed before becoming completely distracted

e.g. Homework, PE kit, water bottle, stationery, consistently and despite reminders

e.g. A noise outside the classroom window pulling their attention entirely away from the lesson

e.g. Forgetting to hand in work they completed, missing that they had a test, not passing on letters from school

e.g. Finding every reason to delay starting homework, despite being capable of the work

Inattentive ADHD has its own distinct symptom profile. Read more about inattentive type ADHD in children.

Energy and Impulse (hyperactive-impulsive type ADHD)

e.g. Getting up repeatedly during class, mealtimes, or homework, often without realising they have done it

e.g. Unable to walk calmly down a corridor, always running, touching walls, jumping off things

e.g. Everything becomes louder and more physical than the situation calls for

e.g. Narrating their thoughts out loud, continuing a conversation after others have moved on

e.g. Calling out in class, unable to wait, even when they know they are supposed to put their hand up

e.g. In games, in conversation, in queues, the waiting itself is genuinely distressing

e.g. Joining other children’s games uninvited, finishing adults’ sentences, difficulty reading when to stay quiet

Hyperactive-impulsive ADHD presents differently to what most people expect. Explore hyperactive-impulsive ADHD in children.

Emotions and Behaviour (all types)

e.g. Melting down when a game does not go their way, when something breaks, or when a plan changes unexpectedly

e.g. Going from calm to overwhelmed in seconds; struggling to bring emotions back down once they have escalated

e.g. A significant reaction when asked to stop one thing and start another, even something they would normally enjoy

e.g. Beginning to describe themselves as stupid, bad, or different from other children

e.g. Other children finding them hard to play with, friendships that break down repeatedly in the same way

Emotional dysregulation is one of the most overlooked aspects of ADHD in children. Learn more about combined type ADHD and emotional symptoms in children.

How ADHD presents differently in children

Two factors shape how ADHD presents in children more than any other: the setting they are in, and how old they are.

What a thorough assessment looks at

A comprehensive child ADHD assessment gathers information from multiple sources: a detailed clinical interview with parents, standardised rating scales completed by parents and teachers, and a clinical interview with the child themselves. Symptoms must be evident in more than one setting and must not be better explained by another condition.

ADHD presentation in Children: School Versus Home

One of the most common things parents hear is: we do not see any of that at school. Or the opposite: the school is telling us there is a problem but we do not see it at home. Both are valid. ADHD symptoms can look very different depending on the demands of the environment.

At school, structure, noise, social pressure, and the expectation of sustained attention create conditions where ADHD symptoms are more visible. At home, a child may hold themselves together all day and then fall apart in a safe environment. This is sometimes called the afterschool restraint collapse, and it is not defiance. It is exhaustion.

ADHD presentation in Children: By Age

In younger children, hyperactivity is often most prominent. As children reach middle childhood, inattentive symptoms often become more impairing as academic demands increase. The ability to sit still may improve with age, but the internal experience of ADHD, including distractibility, poor working memory, and emotional dysregulation, typically continues.

How ADHD symptoms differ across age and gender

ADHD looks different depending on who you are, how old you are, and how long it has gone unrecognised.

ADHD Symptoms in Boys

ADHD Symptoms in Girls

ADHD Symptoms in Women

ADHD Symptoms in Men

ADHD Symptoms in Adults

ADHD Symptoms in Teens

ADHD misdiagnoses and conditions that commonly co-occur in children

ADHD in children is frequently mistaken for other things, and frequently exists alongside them. Understanding what is ADHD and what is something else, or both, requires a specialist assessment.

Autism spectrum conditions (AuDHD)

ADHD and autism co-occur in a significant proportion of children. Each condition can mask the other during assessment. A specialist who understands both is essential for an accurate diagnosis. The combination is sometimes called AuDHD.⁸

Oppositional defiant disorder (ODD)

ODD is the most common comorbidity in children with ADHD, present in approximately 35 percent of cases. ODD involves persistent defiant and argumentative behaviour. It is important to assess whether the defiance is driven by unmanaged ADHD symptoms rather than being a standalone condition.⁷

Anxiety disorders

Anxiety and ADHD share several surface features: restlessness, difficulty concentrating, and avoidance of tasks. A 2025 meta-analysis found anxiety disorders are present in approximately 18 percent of children with ADHD. The two frequently co-occur and each can mask the other during assessment.⁷

Specific learning differences

Dyslexia, dyspraxia, and dyscalculia frequently co-occur with ADHD. A child who struggles to read is not automatically dyslexic, and a child who struggles to concentrate is not automatically ADHD. A thorough assessment considers each separately.

Conduct disorder

Present in approximately 11 percent of children with ADHD. Important to distinguish from ADHD-driven impulsivity, which is not intentional or goal-directed in the way conduct disorder behaviours tend to be.⁷

Sleep disorders

Sleep difficulties are common in children with ADHD and can themselves worsen attention and behaviour. Poor sleep should not be assumed to be the cause of ADHD-like symptoms without a full assessment.

Important

Similar symptoms do not mean the same diagnosis

ADHD in children rarely presents in isolation. A specialist assessment is designed to consider all conditions that may be present, rather than identifying a single explanation for a child’s difficulties.

Why ADHD in children goes undiagnosed

There are several reasons why ADHD in children may unaddressed or underdiagnosed:

When people picture ADHD in a child they picture an uncontrollable boy. A quiet, underperforming, or anxious child, particularly a girl, is less likely to be referred for assessment.⁴

Bright but lazy. Boys will be boys. She is just a dreamer. These phrases describe children who are frequently underachieving relative to their potential, not because of attitude but because of unidentified ADHD.

A child who holds it together in a structured school environment but falls apart at home can slip through the gap. Neither setting sees the full picture without the other.

Average waits for a child ADHD assessment through NHS CAMHS are 2 to 3 years in many areas. A child referred at age 7 may not be assessed until they are 9 or 10, missing the entire primary school window for support.⁵

Analysis of UK data found that girls with ADHD are less likely to access services than boys with the same symptoms. Social pressure to appear well-behaved and academically engaged leads many girls to compensate quietly until the demands of secondary school or adolescence make it unsustainable.⁹

Frequently Asked Questions

At what age can a child be diagnosed with ADHD?

NICE guidance recommends that ADHD should not be diagnosed in children under 5 except in exceptional circumstances.1 For children aged 5 and above, a comprehensive assessment can lead to a diagnosis where symptoms are present in more than one setting and cannot be better explained by another condition.

Can a child have ADHD if they can focus on things they enjoy?

Yes. The ability to hyperfocus on engaging activities is a recognised feature of ADHD, not evidence against it. ADHD is not a global inability to pay attention. It is a difficulty regulating attention, which means a child can be absorbed for hours in a video game and unable to focus for five minutes on homework. Both can be true at the same time.

Do I need a GP referral to get my child assessed privately?

No. ADHD Certify is a private specialist clinic. You can book a child assessment directly without a GP referral. Our clinicians are experienced in assessing ADHD in children and will gather information from you, your child, and where relevant, their school.

My child's school says there is no problem. Can they still have ADHD?

Yes. ADHD symptoms can present very differently in different settings. Some children use significant effort to manage in structured school environments and then struggle significantly at home. Others are managed in school through avoidance, withdrawal, or compliance, without anyone recognising what is happening. A comprehensive assessment considers information from both settings.

What is the difference between ADHD and just being energetic or inattentive?

All children can be inattentive or energetic at times. ADHD is distinguished by the persistence, pervasiveness, and degree of impairment. Symptoms must be present in more than one setting, significantly out of step with what would be expected for the child’s age, and causing meaningful difficulty in daily functioning.

Will my child need medication?

Not necessarily. Treatment for children with ADHD is determined by age, severity, and clinical assessment. NICE guidance recommends parent training and school-based support as first-line interventions for children under 5 and for mild-to-moderate presentations. Medication may be considered for school-age children with more significant impairment, following a thorough clinical assessment.

How is a child ADHD assessment different from an adult one?

A child assessment involves gathering information from parents and teachers as well as the child themselves. Standardised rating scales are completed by both parents and school staff. The clinical interview considers developmental history from early childhood, alongside current presentation. The assessment is designed to build a picture of the child across different settings and contexts.

Can ADHD affect my child's progress at school?

Yes. Children with ADHD and co-occurring emotional difficulties have significantly greater odds of missed school days and are at higher risk of underachievement relative to their intellectual ability.¹⁰ A diagnosis can open the door to reasonable adjustments including extra time in exams, a quieter working environment, and targeted support from school staff.

References

National Institute for Health and Care Excellence (NICE). Attention deficit hyperactivity disorder: diagnosis and management. NICE Guideline NG87. Updated 2019. Available at: nice.org.uk/guidance/ng87
NHS England Digital. ADHD Management Information, November 2025. Available at: digital.nhs.uk/data-and-information/publications/statistical/mi-adhd/november-2025

American Psychiatric Association. Diagnostic and Statistical Manual of Mental Disorders, Fifth Edition (DSM-5). Washington DC: American Psychiatric Publishing; 2013.
Lim AXH et al. An item-level systematic review of the presentation of ADHD in females. BJPsych Open. 2024;10. doi:10.1192/bjo.2024.83 [Citing sex differences in referral rates for inattentive presentations in children]
The Send List. CAMHS Waiting Times for Neurodivergent Children. Updated June 2026. Available at: thesendlist.co.uk/camhs-waiting-times-neurodivergent-children-uk. [Citing NHS Benchmarking Network data and YoungMinds 2023/24 report]
Barkley RA. Attention-Deficit Hyperactivity Disorder: A Handbook for Diagnosis and Treatment. 4th ed. New York: Guilford Press; 2015.
Gomez-Tabares AS et al. Psychiatric comorbidities in children and adolescents with ADHD: a systematic review and meta-analysis. ScienceDirect. 2025. [Citing ODD 34.7%, Anxiety 18.4%, Conduct Disorder 10.7% prevalence rates]
Faraone SV et al. The World Federation of ADHD International Consensus Statement. Neuroscience and Biobehavioral Reviews. 2021;128:789-818. doi:10.1016/j.neubiorev.2021.01.022
Martin J et al. Sex differences in ADHD diagnosis and clinical care: a national study of population healthcare records in Wales. Journal of Child Psychology and Psychiatry. 2024. doi:10.1111/jcpp.13987
Blackman GL et al. Social and emotional difficulties in children with ADHD and the impact on school attendance and healthcare utilisation. BMC Pediatrics. 2005. PMC3489829. [Evidence base on educational impact of comorbid ADHD and emotional difficulties]