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    ADHD in adults: symptoms, diagnosis, the ASRS and treatment

    About half of the 15.5 million US adults with a current ADHD diagnosis in 2023 were diagnosed in adulthood.[1][2] An adult diagnosis still requires symptoms that began before age 12 and cause difficulties in more than one setting, assessed by a specialist.[3][4] NICE recommends lisdexamfetamine or methylphenidate as first-line medicines for adults, with structured psychological support when non-drug treatment is indicated.[5][6]

    Editor reviewedStrict sourcingUpdated ExplainerMental health, Health and medicine

    ADHD is not only a childhood condition. In a 2023 CDC survey, 15.5 million US adults reported a current ADHD diagnosis, and about half of them were diagnosed as adults.[1][2] This page explains how adult ADHD is recognised and treated, and where the evidence is weaker.

    This page is not medical advice and is not a self-diagnosis tool. Screening questionnaires cannot diagnose ADHD. If you think you may have ADHD, talk to a doctor or other qualified clinician.

    How ADHD shows up in adults

    In adults, the NHS describes inattention as being easily distracted or forgetful, finding it hard to organise time, follow instructions or finish tasks, and often losing things like keys or a phone. Hyperactivity and impulsivity can look like restlessness, talking a lot or interrupting, and making quick decisions without thinking about the result.[7] These symptoms usually start before age 12.[8] ADHD is thought to be recognised less often in women, possibly because inattentive symptoms are harder to notice than hyperactive ones.[9]

    The same DSM symptom lists apply to adults, but the threshold drops from six to five symptoms in a domain from age 17.[10] For an adult diagnosis, symptoms must have been present before age 12, noticeable for at least six months and causing difficulties in more than one setting.[3] Persistent adult ADHD with childhood onset was estimated at 2.58% of adults worldwide in a 2021 meta-analysis, compared with 6.76% for symptomatic adult ADHD regardless of childhood onset.[11] Depression, anxiety, addictions and learning difficulties often co-occur, and autism, Tourette’s and anxiety can produce similar symptoms.[12]

    Assessment and the ASRS

    The NHS route starts with a GP, who may refer to a specialist. At the assessment, a psychiatrist or other ADHD specialist asks about the history of symptoms, particularly whether they began in childhood, and may contact a family member or close friend.[4] Waits can be long: the NHS says some people wait several months or years.[13]

    The WHO Adult ADHD Self-Report Scale (ASRS) was developed by Ronald Kessler and colleagues with WHO. It has 18 questions about how often adult ADHD symptoms occur, and a six-question screener drawn from them.[14] In its 2005 validation in 154 US survey respondents, the six-question screener had 68.7% sensitivity and 99.5% specificity compared with blind clinical diagnosis.[15] In plain terms, the screener missed about three in ten people that clinicians diagnosed, so a screener result is a reason to see a clinician, not a diagnosis.[15] We do not reproduce the questionnaire here.

    Treatment

    NICE says adults should be offered medicine if ADHD still causes significant problems after practical changes at work or home have been tried.[16] Its first-line medicines for adults are lisdexamfetamine or methylphenidate.[5] For adults who choose not to take medicine, or for whom it does not work, NICE recommends structured psychological support, which may include cognitive behavioural therapy (CBT).[6] Medicines must be started and monitored by an ADHD specialist in the NHS.[17] See the medication guide for details.

    A 2025 component network meta-analysis of 113 randomised trials in adults found that stimulants and atomoxetine were the only interventions to reduce core symptoms in the short term on both self-reported and clinician-reported scales. CBT, mindfulness and psychoeducation improved clinician-rated scores only.[18] The same review found medicines did not improve outcomes such as quality of life and that long-term evidence is thin.[19] An earlier network meta-analysis supported amphetamines as preferred first-choice medicines for adults in the short term.[20] All ADHD medicines studied raised blood pressure or pulse slightly in short trials, and reviewers advised monitoring for any ADHD medicine.[21]

    Access in the US

    Many adults now get ADHD care remotely: in 2023, 46.0% of US adults with ADHD had used telehealth for it, and 30.5% had used telehealth to get a prescription since March 2020.[22] Among adults taking stimulants, 71.5% reported trouble filling a prescription because the medicine was unavailable.[23] The DEA rules that allow stimulants to be prescribed by video without an in-person visit run until 31 December 2026.[24] The ADHD shortage and telehealth tracker follows both issues, and the analysis of rising adult diagnoses sets out why diagnoses have grown.

    Next in the crash course

    Questions readers ask

    Can you be diagnosed with ADHD as an adult?

    Yes. About half of US adults with a current ADHD diagnosis in 2023 received it in adulthood. When diagnosing adults, clinicians look for symptoms that were present before age 12 and caused difficulties in more than one setting.[2][3]

    What does adult ADHD look like?

    The NHS lists signs such as being easily distracted or forgetful, finding it hard to organise time or finish tasks, often losing things, feeling restless, interrupting, and making quick decisions without thinking.[7]

    What is the ASRS?

    The WHO Adult ADHD Self-Report Scale is an 18-question screening scale about the frequency of adult ADHD symptoms, with a six-question screener version. It is a screening tool, not a diagnosis; in its 2005 validation study the screener had 68.7% sensitivity and 99.5% specificity.[14][15]

    How is adult ADHD diagnosed?

    In the NHS, a specialist such as a psychiatrist asks about the history of symptoms, particularly whether they started in childhood, looks at work, relationships and medical history, and may speak to someone who knows the person well.[4]

    Is ADHD under-diagnosed in women?

    The NHS says ADHD is thought to be recognised less often in women than men, possibly because women more commonly have inattentive symptoms, which can be harder to recognise.[9]

    What treatments work for adult ADHD?

    NICE recommends lisdexamfetamine or methylphenidate first. A 2025 network meta-analysis found stimulants and atomoxetine were the only treatments with short-term benefit on both self-rated and clinician-rated symptoms; CBT, mindfulness and psychoeducation improved clinician-rated symptoms.[5][18]

    Sources

    · 24 claims from 8 publishers

    Each numbered claim is a statement we checked against the sources listed with it. Tap a number in the text to see its sources in place.

    1. [1]

      CDC estimated that 15.5 million US adults (6.0%) had a current ADHD diagnosis in 2023, based on self-report. confirmedas of 2024-10-10

    2. [2]

      About half of US adults with a current ADHD diagnosis in 2023 were diagnosed in adulthood. confirmedas of 2024-10-10

    3. [3]

      The APA says ADHD symptoms must have been noticeable over at least the past six months and, when diagnosing adolescents or adults, must have been present before age 12 and caused difficulties in more than one setting. confirmedas of 2026-10-11

      • What is ADHD? · American Psychiatric Association · Diagnosis section, which also states symptoms are "noticeable over at least the past six months" (retrieved 2026-10-11)
    4. [4]

      In an NHS adult ADHD assessment, a specialist such as a psychiatrist asks about the history of symptoms, particularly whether they started in childhood, and may contact someone who knows the person well. confirmedas of 2025-03-19

      • ADHD in adults · NHS (nhs.uk) · 2025-03-19 · What happens at an ADHD assessment (retrieved 2026-10-11)
    5. [5]

      NICE recommends lisdexamfetamine or methylphenidate as first-line medicines for adults with ADHD. confirmedas of 2019-09-13

    6. [6]

      When non-drug treatment is indicated for adults, NICE recommends at minimum a structured supportive psychological intervention focused on ADHD with regular follow-up, which may include CBT. confirmedas of 2019-09-13

    7. [7]

      The NHS lists adult signs of inattention such as being easily distracted or forgetful, finding it hard to organise time, and often losing things, and signs of hyperactivity and impulsivity such as restlessness, interrupting and making quick decisions without thinking. confirmedas of 2025-03-19

      • ADHD in adults · NHS (nhs.uk) · 2025-03-19 · Symptoms of ADHD (retrieved 2026-10-11)
    8. [8]

      The NHS says ADHD symptoms usually start before the age of 12. confirmedas of 2025-03-19

      • ADHD in adults · NHS (nhs.uk) · 2025-03-19 · Symptoms of ADHD (retrieved 2026-10-11)
    9. [9]

      The NHS says ADHD is thought to be recognised less often in women than men, possibly because women more commonly have inattentive symptoms, which can be harder to recognise. confirmedas of 2025-03-19

      • ADHD in adults · NHS (nhs.uk) · 2025-03-19 · Symptoms of ADHD (retrieved 2026-10-11)
    10. [10]

      Under the DSM criteria as described by the American Psychiatric Association, a diagnosis of the inattentive or hyperactive type requires six frequent symptoms from the relevant list, or five for people aged 17 or older. confirmedas of 2026-10-11

      • What is ADHD? · American Psychiatric Association · Inattentive type; the hyperactive type uses the same six-or-five rule (retrieved 2026-10-11)
    11. [11]

      A 2021 global meta-analysis estimated the prevalence of persistent adult ADHD (with childhood onset) at 2.58% and of symptomatic adult ADHD at 6.76% in 2020. confirmedas of 2021-02-11

    12. [12]

      The NHS says GPs may consider other conditions that can cause similar symptoms, such as autism, Tourette's or anxiety, and that people with ADHD often have other conditions such as depression, anxiety, addictions or dyslexia. confirmedas of 2025-03-19

      • ADHD in adults · NHS (nhs.uk) · 2025-03-19 · Getting help with ADHD (retrieved 2026-10-11)
    13. [13]

      The NHS says people in England may wait several months or years for an ADHD assessment. confirmedas of 2025-03-19

      • ADHD in adults · NHS (nhs.uk) · 2025-03-19 · Waiting times for ADHD assessments (retrieved 2026-10-11)
    14. [14]

      The WHO Adult ADHD Self-Report Scale (ASRS) has 18 questions about the frequency of DSM-IV ADHD symptoms in adults, and a six-question screener version drawn from them. confirmedas of 2005-02-01

    15. [15]

      In a 2005 validation study of 154 US survey respondents, the six-question ASRS screener had 68.7% sensitivity and 99.5% specificity against blind clinical diagnoses. confirmedas of 2005-02-01

    16. [16]

      NICE says medication should be offered to children aged 5 and over, young people and adults only if ADHD symptoms still cause significant impairment after environmental changes have been made and reviewed. confirmedas of 2019-09-13

    17. [17]

      The NHS says ADHD medicines must be started and monitored by an ADHD specialist; for adults these include methylphenidate or lisdexamfetamine, and not everyone with ADHD needs or wants medicine. confirmedas of 2025-03-19

      • ADHD in adults · NHS (nhs.uk) · 2025-03-19 · Medicines (retrieved 2026-10-11)
    18. [18]

      A 2025 network meta-analysis of 113 randomised trials in adults found that stimulants and atomoxetine were the only treatments with short-term benefit on core ADHD symptoms on both self-reported and clinician-reported scales; CBT, mindfulness and psychoeducation improved clinician-rated symptoms only. confirmedas of 2025-01-01

    19. [19]

      The 2025 adult network meta-analysis found ADHD medicines were not efficacious on outcomes such as quality of life, and that longer-term evidence is under-investigated. confirmedas of 2025-01-01

    20. [20]

      A 2018 network meta-analysis of 133 double-blind randomised trials concluded that, weighing efficacy and safety, methylphenidate in children and adolescents and amphetamines in adults are preferred first-choice medicines for short-term ADHD treatment. confirmedas of 2018-08-07

    21. [21]

      A 2025 network meta-analysis of 102 short-term randomised trials found that stimulants and the non-stimulants atomoxetine and viloxazine raised blood pressure and pulse slightly, and its authors advised monitoring for any ADHD medicine, not stimulants only. confirmedas of 2025-04-06

    22. [22]

      Almost half of US adults with ADHD (46.0%) reported ever receiving telehealth services for the condition, and since March 2020 about 30.5% used telehealth to obtain an ADHD medication prescription. confirmedas of 2024-10-10

    23. [23]

      About one third of US adults with ADHD took stimulant medication in 2023, and 71.5% of those reported difficulty getting their prescription filled in the previous 12 months because the medication was not available. confirmedas of 2024-10-10

    24. [24]

      On 31 December 2025 DEA and HHS published a fourth extension of the telemedicine flexibilities, effective 1 January 2026 through 31 December 2026. confirmedas of 2025-12-31

    Revision history (1)
    1. Page created.

    Created Oct 11, 2026. Last reviewed by an editor on Oct 11, 2026. Next scheduled review: Jan 11, 2027.

    Cite this page

    "ADHD in adults: symptoms, diagnosis, the ASRS and treatment." ContentLora, updated Oct 11, 2026. https://contentlora.com/explain/adult-adhd-explained

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