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Concept

ADHD

ADHD can affect attention, activity, impulsivity and managing everyday tasks. It can look different between people and situations, and diagnosis needs more than a checklist or a single test.

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Last reviewed: 12 August 2026

More precise description

ADHD is a neurodevelopmental condition involving persistent patterns of inattention and/or hyperactivity-impulsivity that begin in childhood, occur across important settings and can affect daily life through adulthood, with presentation and support needs varying between people and over time.

At a glance

This page covers

  • Current clinical descriptions and assessment across childhood and adulthood.
  • Functional impact, co-occurrence, environmental demands and support.
  • Evidence about executive-function and sensory differences without treating them as diagnostic equivalents.

It does not mean

  • Individual diagnosis or medication advice.
  • The idea that ordinary distraction, high activity or one rating-scale result establishes ADHD.
  • Treating executive-function test performance as a diagnostic test for ADHD.
  • A universal claim that every person with ADHD has the same impairments or strengths.

What we can say

These are bounded statements from the current evidence record. See what the confidence labels mean. Open a statement only if you want its evidence route.

ADHD is a neurodevelopmental condition in which persistent inattention and/or hyperactivity-impulsivity begins in childhood, occurs across important settings and is associated with meaningful impairment; symptoms and impact can continue into adulthood and change over time.

high confidence
Evidence and uncertainty behind this statement

ADHD diagnosis is based on specialist clinical assessment, developmental and psychiatric history, functioning across settings and consideration of alternatives and co-occurring conditions; no single rating scale, observation or cognitive test is sufficient by itself.

high confidence
Evidence and uncertainty behind this statement

Executive-function difficulties are common at group level in ADHD, but profiles are heterogeneous and executive-function measures do not uniquely distinguish ADHD from autism or other neurodevelopmental conditions.

high confidence
Evidence and uncertainty behind this statement

ADHD-related impairment depends partly on environmental demands, and individualised environmental modifications can be part of support rather than treating the person as the only thing that must change.

high confidence
Evidence and uncertainty behind this statement

What remains uncertain

Which supports remain useful as ADHD presentation, responsibilities and environments change through adulthood and ageing?

Evidence and services have historically emphasised children and younger adults.

What could reduce this uncertainty?
  • Longitudinal studies across adulthood and older age using person-defined functional outcomes.
Status: open

How do gender, culture, race, class, masking and access pathways affect recognition, delayed diagnosis and misdiagnosis?

Referral patterns and assessment tools can create inequity even when diagnostic criteria are nominally the same.

What could reduce this uncertainty?
  • Measurement-invariance research and audits of referral, assessment and outcomes across underserved groups.
Status: open

Which cognitive and behavioural measures add useful information to ADHD assessment without being mistaken for diagnostic biomarkers?

Group differences can be real while still being too heterogeneous or nonspecific for individual diagnosis.

What could reduce this uncertainty?
  • Prospective diagnostic-accuracy studies against rigorous clinical assessment across ADHD, autism and other comparison groups.
Status: open

Which environmental modifications and non-pharmacological supports improve outcomes people with ADHD value, for whom and in which settings?

A named accommodation can add burden or fail if it does not address the actual demand.

What could reduce this uncertainty?
  • Pragmatic trials and N-of-1 studies with person-defined outcomes, adherence burden and longer follow-up.
Status: open

Different perspectives

Useful next routes

Practical questions

Related resources

Sources

Open canonical Evidence record

Faraone SV et al. The World Federation of ADHD International Consensus Statement: 208 Evidence-based conclusions about the disorder. Neuroscience & Biobehavioral Reviews. 2021;128:789-818.

Kind: peer_reviewed · accessed 2026-08-12

Open source

Open canonical Evidence record

Kofler MJ et al. Executive function deficits in attention-deficit/hyperactivity disorder and autism spectrum disorder. Nature Reviews Psychology. 2024;3(10):701-719.

Kind: peer_reviewed · accessed 2026-08-12

Open source

Open canonical Evidence record

Sadozai AK et al. Executive function in children with neurodevelopmental conditions: a systematic review and meta-analysis. Nature Human Behaviour. 2024;8(12):2357-2366.

Kind: peer_reviewed · accessed 2026-08-12

Open source

Open canonical Evidence record

Jurek L et al. Sensory Processing in Individuals With Attention-Deficit/Hyperactivity Disorder Compared With Control Populations: A Systematic Review and Meta-Analysis. Journal of the American Academy of Child & Adolescent Psychiatry. 2025;64(10):1132-1147.

Kind: peer_reviewed · accessed 2026-08-12

Open source

Page provenance and review state

Batch B original-five evidence review authorised by the owner on 2026-08-12 and promoted from preserved candidate blob c55adf286bb91341866c9a95857637065fc469a9; candidate history remains preserved.

Created 2026-08-10 · last reviewed 12 August 2026 · review state editor_reviewed