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.
children and young people aged 5 to 24 estimated to have ADHD in England 2
Two factors shape how ADHD presents in children more than any other: the setting they are in, and how old they are.
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.
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.
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.
ADHD symptoms in women
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.
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
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
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.
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 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.
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.
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
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.
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.
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.
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.
References
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Book directly with ADHD Certify. No GP referral is needed for a private assessment, and online or in-person routes are available.
