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Signs of ADHD in children include persistent inattention, impulsivity and hyperactivity that are more severe than in peers of the same age. This guide explains what to look for at different ages and when to seek a formal assessment.
Signs of ADHD in children typically become most apparent when the demands of school or structured activities highlight difficulties with attention, impulse control and activity regulation. However, ADHD is not a school problem alone: the signs must be present across multiple settings, including home. ADHD is diagnosed when these signs are more persistent, more severe and more impairing than what is typical for a child’s developmental level. Understanding what ADHD looks like at different ages helps parents and teachers identify when assessment might be appropriate.
SENDhelp places specialist SEN teachers, teaching assistants and support staff in schools and provisions across North London, Bedfordshire, Buckinghamshire and Hertfordshire. If your school needs staff experienced with ADHD, we can help.
Signs of ADHD in preschool children may include extreme difficulty sitting still for even brief structured activities, very high levels of impulsivity including grabbing toys from other children, running when walking is expected, excessive talking, very short attention span even for preferred activities and inability to wait even briefly for turns or rewards. These behaviours are common in young children but in those who later receive an ADHD diagnosis they are notably more extreme and more persistent than in peers.
At primary school age, ADHD signs often become more clearly apparent as the demands of sustained attention, following instructions and remaining seated increase. Signs include failing to complete tasks even when started, losing equipment, making careless mistakes, appearing not to listen when spoken to directly, being easily distracted by external stimuli, difficulty waiting their turn, calling out in class, running or climbing when inappropriate, forgetting homework or school materials and finding it very hard to sit still during lessons.
In secondary school, the organisational demands of multiple subjects, teachers and deadlines can highlight ADHD difficulties significantly. Signs include consistent failure to complete homework or coursework despite apparent understanding of the material, losing track of assignments and deadlines, difficulty managing time effectively, struggling to organise notes and materials across multiple subjects, underperformance relative to apparent ability and increasing difficulties with peers or authority related to impulsivity and emotional dysregulation.
All children can be inattentive, impulsive and active at times. ADHD is diagnosed when these behaviours are significantly more frequent, more severe and more impairing than in peers of the same developmental level, when they have been present across multiple settings for at least six months and when they cause meaningful functional impairment. A child who is briefly distracted in class does not have ADHD. A child who cannot sustain attention on any task for any meaningful period, regardless of the setting or the demand, may well have ADHD.
ADHD is diagnosed approximately three times more often in boys than in girls during childhood. Boys with ADHD more commonly present with the combined or hyperactive-impulsive presentation, which is more visible and more likely to prompt a referral. Girls with ADHD more commonly present with the predominantly inattentive type, which is less disruptive and therefore less likely to draw professional attention. As a result, girls with ADHD are often identified later and may be missed entirely in childhood.
Parents or carers who have significant concerns about their child’s attention, impulsivity or activity levels should speak to their GP or the school SENCO. There is no benefit in waiting to see whether concerns resolve. Before the referral appointment, keeping a diary of specific examples of the behaviours and when they occur, as well as gathering information from the school about how the child is performing and presenting, is helpful in supporting the referral.
For related information see our articles on ADHD Explained and ADHD Diagnosis Process.
ADHD in children typically involves persistent and severe inattention, impulsivity and hyperactivity that are more extreme than in peers of the same age. Children with ADHD may struggle to complete tasks, lose things constantly, act before thinking, have great difficulty waiting, interrupt frequently, find it very hard to sit still and underperform at school relative to their apparent ability.
ADHD is most commonly diagnosed between the ages of 7 and 12, when the demands of primary school make the difficulties more apparent. However, some children are identified earlier, particularly those with severe hyperactivity, and others are not identified until secondary school or adulthood, particularly those with the predominantly inattentive presentation.
A teacher raising concerns about ADHD is a significant indication that a formal assessment may be appropriate. Teachers see children across a structured day and across multiple demands, and teacher observations are an important part of the ADHD assessment process. Speak to your GP about a referral for a formal ADHD assessment and ask the school SENCO to document their observations in support of the referral.
Visit our Understanding ADHD hub for more guides on signs, diagnosis, types, medication, executive function and co-occurring conditions.
The information in this article is provided for educational purposes only and is not intended as medical advice. If you have concerns about ADHD or any neurodevelopmental condition, speak to a qualified healthcare professional. SENDhelp Education Limited accepts no responsibility or liability for any loss or damage arising from reliance on this content. Any links to third-party websites are provided for convenience only and do not constitute endorsement of their content.
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