ADHD: Your questions answered
19 August, 2026
Few conditions attract as much commentary as ADHD, and it can be difficult to know what information is accurate or not.
The negative tropes claim that it’s a fashionable label, a social-media diagnosis, or just ‘medicalising’ ordinary distraction, but the evidence tells a different story. ADHD is well characterised, understood and responds well to treatment but there can be serious consequences for individuals when it goes unrecognised. Equally there can be serious consequences if ADHD is misdiagnosed or a comorbid condition missed or mislabelled as ADHD.
Is it normal variation and behaviour being medicalised?
There has been some debate as to whether ADHD could be being over diagnosed and whether some individuals might be receiving an inaccurate diagnosis. Everyone loses their keys, sometimes, but this doesn’t mean they have a neurodevelopmental condition. The criteria to diagnose ADHD requires symptoms to be present since childhood, persisting, and causing at least moderate impairment across two or more areas of life – home, work, education and relationships. Being easily distracted on its own is not ADHD.
Presentation shifts with circumstances, which is one reason people are identified late. Difficulties often surface when external scaffolding falls away, such as when a person begins university, gets a promotion into management, or becomes a parent or carer. Symptoms fluctuate with sleep, stress, demand, hormonal cycles and menopause. Many adults may go unrecognised as children because they were bright, well supported, or simply quiet and because no-one picked it up.
If there's no blood test or brain scan, how is it diagnosed?
There isn't a blood test or scan that can detect ADHD, but that is not unusual in medicine. There is no blood test for migraines or depression, and Parkinson's disease and rheumatoid arthritis have long been diagnosed clinically by using a patient’s history, a thorough examination and defined criteria. What matters is that those assessing for ADHD are well trained and supervised, in a team experienced in the condition, its consequences and the conditions it can overlap with.
What we do have is substantial. ADHD is highly heritable and runs in families. Twin studies put this at 70–80%, comparable to height, though no single gene is responsible and environment matters too. Large international collaborations find average differences in brain function between groups of people with and without ADHD, but these are group-level findings: invisible on an individual scan, and not usable for diagnosis. The World Federation of ADHD's international consensus statement sets out 208 evidence-based conclusions: whatever you think about ADHD, its scientific basis is not in doubt.
Why are more people being diagnosed?
The number of people receiving an ADHD diagnosis has increased significantly in recent years and this has made some people question whether the condition might be being over diagnosed. Others are worried that online tests and social media content can suggest someone has ADHD without them receiving a high-quality assessment.
It is vital that we work to understand why this rise is happening and it is likely that a variety of factors are at play here. The criteria for a good quality assessment have not changed significantly during this period and so it is particularly important that we ensure this is being consistently applied and take an evidence-based approach towards understanding this issue.
The independent ADHD Taskforce found ADHD is systematically under-recognised in England: it affects 3–5% of the population, yet recorded diagnoses reach only 0.74% of men and 0.20% of women, and just 15–25% of those affected receive medication. Waits of four years for children and eight or more for adults are common.
Demand has risen because recognition has risen. ADHD was long assumed to be something children grew out of, so adult services were rarely commissioned; those that exist are typically small, under-resourced and poorly integrated with other mental health care. COVID-19 lockdowns, educational disruption and social and economic circumstances may also have worsened difficulties for undiagnosed people.
Closing the gap requires investment and training across a broad workforce. The Royal College of Psychiatrists is pleased to be playing our part by developing a neurodevelopmental credential with the Royal College of Paediatrics and Child Health and the Royal College of General Practitioners, with support from NHS England.
The UK Government must also play their part. We need to see implementation of national strategies that enable the mental health and wider healthcare workforce to be effectively retained and recruited to meet the scale of the demand. This will need to include the government in England publishing the much awaited 10 Year Workforce Plan alongside a follow up Mental Health Workforce Plan.
Does a diagnosis of ADHD change anything?
It can, because unrecognised ADHD is not trivial. A UK matched cohort of 30,039 adults with diagnosed ADHD found life expectancy reduced by around seven years for men and nearly nine for women; Danish national data show mortality roughly twice that of the general population, driven largely by accidents.
The Taskforce reported ADHD in some 17% of young offenders and 25% of the prison population, and put the cost to the UK economy at roughly £17 billion a year. Rates of school exclusion, unemployment, dementia, serious psychiatric illness, substance use, self-harm and suicide are all elevated. Diagnosis helps a person and their family understand those difficulties, and opens the door to treatment, reasonable adjustments and support.
Is there a risk with taking ADHD medication?
This is not what the evidence shows. The largest analysis to date pooled 113 randomised trials of over 14,800 adults and found stimulants and other ADHD medicines reliably reduce core symptoms. Psychological approaches such as Cognitive Behavioural Therapy help with coping strategies and co-occurring difficulties.
A 2025 study of 148,581 people newly diagnosed with ADHD found starting medication was associated with 17% fewer suicidal behaviours, 15% less substance use, 12% fewer transport accidents and 13% less criminality. This research also shows treatment significantly reduces the risk of premature death and mortality. Contrary to a persistent myth, treating ADHD reduces later substance use, and risk of psychosis.
No medication is entirely risk-free. A 2025 network meta-analysis of 22,702 people found small average increases in blood pressure and heart rate across drug classes, and this requires monitoring, but the majority of drugs in medicine have some side effects.
The most important thing is that people receive a high-quality assessment which considers the biological, psychological and social factors affecting their health and wellbeing. This should be used to inform a personalised treatment plan which may include a range of different options, such as an ADHD coach, organisational skills training, therapy or medication. People with ADHD don’t always need medication which is why it is so vital that their care and treatment is tailored to their unique needs.
What should a proper assessment include?
A quality adult ADHD assessment is not a simple tick box exercise; it is a holistic look at a person’s life which takes time. The UKAAN standard recommends two hours – and that it should include:
- a full clinical and psychosocial assessment
- a developmental and psychiatric history from childhood onwards
- a semi-structured interview covering every criterion through real-life examples, not yes/no ticks
- observer reports, and where possible quotations from school records or similar
- validated rating scales, mapped to DSM-5-TR or ICD-11 criteria, but considered in the context of the individual
- a mental state examination
- assessment of substance use and other risks
- baseline blood pressure, pulse and weight
- a formulation weighing ADHD's contribution to mental, physical, social and educational challenges, alongside trauma and possible autism or other neurodevelopmental conditions.
Further information from someone who knows you well matters. It need not be a parent: siblings, partners and school reports all help where parents are unavailable, estranged, or were themselves struggling.
Assessment time is needed because co-occurrence is the rule and diagnosis needs to consider a whole person’s life not just a single episode of illness. A large proportion of adults with ADHD have another condition – anxiety, depression, autism, a tic condition such as Tourette syndrome, substance use, or physical health problems including chronic pain and fatigue – alongside traits such as emotional regulation difficulties, dyslexia, dyscalculia or dyspraxia never formally identified. There can be particularly serious negative consequences when some who has psychosis or a severe mood disorder is mislabelled as having ADHD and so it is vital people receive an accurate diagnosis. Disentangling whether restlessness reflects ADHD, anxiety or trauma takes skilled formulation and it does not exist in a vacuum. Someone can have ADHD and trauma, ADHD and autism.
Assessments outside the NHS can be entirely acceptable – provided they meet these standards, in line with NICE guideline NG87 and Good Psychiatric Practice. A diagnosis resting on a self-report questionnaire or a simple proforma does not. Complex cases may need several sessions.
Neurodevelopmental assessments are among the longest appointments in medical practice.
Final thoughts
ADHD is real, its personal, educational, health and societal consequences are measurable, and evidence-based treatments are safe and effective. Rigorous frameworks for thorough assessment exist and the challenge now is to ensure that commissioners adopt and implement them so that patients are able to access high-quality assessments. This will also help ensure people don’t receive a misdiagnosis and struggle to access care or treatment because their assessment didn’t meet the necessary standards. Investment in resources will also help save costs and lives.
Misinformation has consequences too. Where the stakes are this high, good information matters.
Dr Jessica Eccles, Chair of the RCPsych Neurodevelopmental Psychiatry Special Interest Group
Dr Ulrich Müller-Sedgwick, RCPsych ADHD Champion