ADHD prevalence estimates are higher than recorded diagnosis rates. An estimated 2.5 million people in England may have ADHD, while only 1.19% had a diagnosis recorded in primary care.
NHS waiting lists are substantial. Up to 683,059 people may have been waiting for an assessment in England at the end of March 2026.
Many people are waiting more than a year for an assessment. Around 63% of adults and 65% of children on the waiting list had been waiting for over a year.
Assessment demand is continuing to grow. England received 24,480 new referrals in March 2026, up 13.5% from the previous year.
Undiagnosed ADHD may affect millions of people. ADHD UK estimates that around 2 million people in the UK may be undiagnosed, although this is an approximation rather than a confirmed count.
The condition affects both children and adults. UK adult prevalence is estimated at 3–4%, while a sample of English children found a prevalence of 3% among those aged 2–19.
Diagnosis figures do not show the full picture. Differences in how the condition presents and how people are referred can affect recorded diagnosis rates, so prevalence estimates and diagnoses should not be treated as the same measure.
Treatment figures need careful interpretation. Medication prescriptions have increased, but prescription numbers alone cannot show why someone received medication or whether it is the right treatment for them.
The impact extends beyond healthcare. At least £17 billion of the economic costs associated with ADHD are considered avoidable when people receive appropriate support.
Reliable information is important when considering assessment. Anyone concerned about possible ADHD should speak to an appropriate healthcare professional and research assessment options, providers and what happens after diagnosis.
ADHD is one of the most commonly discussed neurological conditions, but understanding how many people have it, how many remain undiagnosed and how long people are waiting for an assessment can be difficult.
With growing demand for assessments and lengthy NHS waiting lists, the latest data provides insights into the scale of ADHD across the UK and the challenges people face when seeking a diagnosis.
We’ve brought together the latest available UK ADHD statistics covering prevalence, diagnosis rates, NHS waiting times, treatment and the wider economic cost of the condition. These ADHD statistics UK figures can help provide a clearer picture of how ADHD affects people across different age groups.
From ADHD prevalence in the UK and how many people may be undiagnosed to the number of people currently waiting for an assessment, these figures provide an overview of the current ADHD landscape.
The top 10 UK ADHD statistics you need to know
Up to 683,059 people may have been waiting for an ADHD assessment in England at the end of March 2026.
There were more than half a million (505,815) open referrals for a possible ADHD diagnosis in England in March 2026.
Just under two in three adults (63%) and children (65%) on the ADHD waiting list have been waiting for a diagnosis for over a year.
An estimated 2.5 million people in England have ADHD (approximately 4.05% of the English population).
ADHD prevalence among adults across the whole of the UK is around 3 to 4%.
An estimated 2 million people in the UK may have undiagnosed ADHD, according to ADHD UK.
England received 24,480 new referrals for an ADHD assessment in March 2026.
At least £17 billion in economic costs (e.g. fewer tax contributions, higher cost of health and social care) associated with ADHD are considered avoidable when people are appropriately supported.
ADHD medication prescriptions rose by a quarter (25%) between 2016-17 and 2025-26, from 1.4 to 4.2 million.
Around 70–90% of people with ADHD are expected to benefit from drug treatment, according to evidence from randomised controlled trials.
ADHD Prevalence UK: What the Data Shows
ADHD prevalence is key to understanding the scale of the condition. However, estimated prevalence and recorded diagnosis rates are not the same thing.
Research suggests that ADHD affects a significant proportion of both children and adults, while many people may remain undiagnosed. These figures are an important part of understanding ADHD prevalence in the UK, particularly when comparing estimated prevalence with recorded diagnoses.
1. NHS Digital estimated that around 2.5 million people in England have ADHD as of May 2026
Dr Narayanaswamy and Dr Bongani Duba, specialists in private ADHD assessment, comment:
“This figure helps to demonstrate just how many people may be living with ADHD in England. It’s important to remember that estimated prevalence and recorded diagnosis are different measures, as not everyone who has ADHD will necessarily have received a formal diagnosis.”
2. ADHD prevalence among UK adults is estimated at 3–4%
“ADHD is not simply a condition associated with childhood. These estimates show that a significant proportion of adults may have ADHD, which is why recognising symptoms and understanding the routes to assessment can be important at any age.”
3. ADHD prevalence among children aged 2–19 was 3% in an English population sample
“ADHD can present in different ways, and its symptoms can vary considerably between individuals. Looking at prevalence in children alongside adult estimates helps demonstrate that ADHD can affect people throughout different life stages.”
4. ADHD is diagnosed more commonly in boys than girls
NICE reports that prevalence ratios are generally estimated at 2–5:1, while some clinical populations show ratios as high as 10:1.
“The difference in recorded diagnosis between males and females needs to be considered carefully. Differences in how ADHD presents can influence whether someone is recognised and referred for assessment, meaning recorded diagnosis rates do not necessarily tell the whole story of prevalence.”
How many people have ADHD in the UK?
There is no definitive answer to how many people have ADHD in the UK with an ADHD diagnosis. Estimates vary depending on the population studied, methodologies and whether researchers are measuring estimated prevalence or recorded diagnoses.
The available figures, however, suggest a considerable gap between the number of people who may have ADHD and the number who have received a formal diagnosis. This distinction is important when interpreting ADHD statistics UK, as prevalence estimates should not be treated as equivalent to confirmed diagnoses.
5. Only 1.19% of people in England had an ADHD diagnosis recorded in their primary care record
The same research noted that recorded diagnosis rates were lower across all age groups than international estimates of actual ADHD prevalence, which typically range between 3% and 5%.
“The difference between estimated prevalence and recorded diagnosis is an important distinction. A diagnosis recorded in a medical record represents people who have been identified and diagnosed, rather than necessarily everyone who meets the criteria for ADHD.”
6. Around 2 million people in the UK may have undiagnosed ADHD
“This estimate highlights the potential scale of undiagnosed ADHD, but it should be treated as an approximation rather than an exact count. Diagnosis requires a proper clinical assessment rather than relying on individual symptoms alone.”
7. Only 0.2% of a population sample received ADHD medication prescriptions
One of the statistics cited by the NHS ADHD Taskforce found that less than one in 100 (0.2%) of 7,655,931 individuals diagnosed with ADHD received prescription medication for it.
“Medication is only one aspect of ADHD management, and not everyone with ADHD needs or chooses medication. However, the statistics highlight the difference between the estimated number of people who may have ADHD and the number receiving pharmacological treatment for it.”
NHS ADHD wait times
One of the biggest challenges facing people seeking an ADHD test for a diagnosis is the length of NHS waiting lists.
Statistic
Adults
Children and young people
People on open referrals for a possible ADHD diagnosis
73.40%
26.60%
Waiting more than one year
63.10%
65.00%
Waiting less than 13 weeks
10.90%
11.40%
Overall waiting list statistic
Figure
People on open referrals for a possible ADHD diagnosis in England
505,815
Additional people potentially waiting through Community Health Services
177,244
Estimated total potentially waiting for an ADHD assessment
Up to 683,059
Longest reported waiting time for children
More than 4 years
Longest reported waiting time for adults
More than 8 years
Waiting times reported in some areas of the UK
10–15 years
8. 505,815 people were on open referrals for a possible ADHD diagnosis in England
Of these:
Just under three-quarters (73.4%) were adults.
Slightly over a quarter (26.6%) were children and young people aged under 18.
“The sheer number of open referrals demonstrates a huge demand for ADHD assessment services. For someone who is already experiencing difficulties associated with possible ADHD, a lengthy wait can add another layer of uncertainty.”
9. Up to 683,059 people may have been waiting for an ADHD assessment
When an additional 177,244 people aged 5–24 potentially waiting through Community Health Services are included, the data suggests that up to 683,059 people may have been waiting for an ADHD assessment at the end of March 2026.
“This is a substantial number of people potentially waiting for an assessment. It is important to clarify that this is an estimate based on different NHS datasets and applies to England, rather than representing a confirmed UK-wide waiting list.”
10. Around 63% of adults had been waiting more than a year
At the end of March 2026, more than six in 10 (63.1%) of adults on the waiting list had been waiting for over a year. For children, the figure was a little less than two-thirds (65%).
Just over a tenth of adults (10.9%) and children (11.4%) had been waiting for less than 13 weeks.
“A year can feel like a very long time when you’re waiting for an assessment, particularly when you’re looking for an explanation for difficulties affecting your everyday life. Understanding the available assessment routes can help make an informed decision about what is right for you.”
11. NHS ADHD waiting times have been reported at more than four years for children and eight years for adults
The same report also noted that waiting lists had been reported to have increased to 10–15 years in some areas of the UK.
“Waiting times can vary significantly between services and locations, so individual patients should check the latest information for the service they have been referred to. However, these figures demonstrate why access to timely ADHD assessment is so important.”
ADHD referrals and demand
Growing numbers of referrals provide further context for the size of current ADHD waiting lists.
12. There were 24,480 new ADHD referrals in England in March 2026
Of these, four in 10 (40%, or 9,785) were for children and young people aged under 18.
“The number of new referrals shows that demand for ADHD assessments remains high. As awareness and recognition of ADHD increase, healthcare services need to be able to respond to people seeking an assessment.”
13. New ADHD referrals increased by 13.5% in one year
In March 2025, up to 20,000 people were newly referred for an ADHD assessment to mental health services. This represented an increase of one in seven (13.5%), or around 2,000 referrals, compared with March 2024.
“Increasing referrals can be positive in terms of recognising people who may need support, but they also place additional pressure on assessment services. This emphasises the need for increased capacity and timely diagnoses.”
ADHD diagnosis and treatment statistics
Diagnosis is only one part of the ADHD journey. For people who receive a diagnosis, ongoing support and treatment can form an important part of managing the condition.
14. Around 270,000 ADHD patients in England were receiving a prescription
This represented slightly over one in 10 (11.5%) of people in England estimated to have ADHD.
“Medication can be an effective treatment option for many people with ADHD, but treatment decisions are often case-by-case. A prescription figure should not be interpreted as meaning that everyone with ADHD should take medication.”
15. The number of adults taking CNS stimulants increased by 40%
NHS data showed that the number of adults taking prescriptions for central nervous system stimulants increased from 190,000 in 2024–25 to 267,000 in 2025–26. That is equivalent to around one in 200 adults taking ADHD medication.
“The rise in prescriptions reflects the increasing number of adults receiving ADHD medication, although prescription numbers alone cannot tell us why an individual has been prescribed medication or whether it is the right treatment for them.”
16. There were 4.2 million ADHD prescriptions in 2025–26
There were 4.2 million prescriptions for ADHD medication in 2025–26, compared with 3.4 million in the previous 12 months and 1.4 million in 2016–17. This is a quarter increase (25%) year-on-year.
“These ADHD statistics UK figures show a long-term increase in prescription items that is consistent with greater recognition and treatment of ADHD. However, prescription volumes should be considered alongside diagnosis rates, prevalence estimates and access to assessment.”
17. Between 70% and 90% of people may benefit from ADHD drug treatment
“Evidence from randomised controlled trials cited by the NHS ADHD Taskforce indicates that medication can be beneficial for many people with ADHD. However, treatment should always be considered on an individual basis, taking into account the person’s specific symptoms, circumstances, preferences and clinical needs.”
The cost of ADHD
ADHD can also have a wider economic impact, particularly where people do not receive adequate support.
18. At least £17 billion of the economic costs of ADHD are considered avoidable
“The economic impact of ADHD extends beyond healthcare. Difficulties associated with untreated ADHD can affect areas such as employment and education, so improving access to appropriate assessment and support can have benefits that extend beyond the individual.”
Why are some people with ADHD still undiagnosed?
Statistics suggest a significant difference between estimated ADHD prevalence and recorded diagnosis. This may be particularly relevant for groups whose symptoms are less likely to result in referral or recognition.
19. Fewer than one-third of children meeting strict diagnostic criteria had contact with a mental health service
“Not everyone who has ADHD will necessarily come into contact with a mental health service. Symptoms often overlap with anxiety, depression or autism spectrum disorder, so a child may be seen for one of these presentations without ADHD itself ever being identified. This is one reason why recorded diagnoses should not automatically be treated as a measure of the total number of people who have ADHD.”
20. Young people who are NEET may have particularly high levels of ADHD
Population data suggests 20–34% of young people who are not in education, employment or training (NEET) are likely to have ADHD, most of whom will not be diagnosed.
“This data highlights the importance of considering ADHD in the context of a person’s wider circumstances. For some people, difficulties associated with ADHD can interfere with their education, employment and other areas of daily life.”
What can you do if you’re waiting for an ADHD assessment?
The current NHS ADHD wait times mean that some people may face a significant period of uncertainty before receiving an assessment.
If you think you may have ADHD, the first step is to speak to an appropriate healthcare professional about your concerns and understand the assessment process.
It can also be useful to:
Understand your symptoms and how they affect your everyday life.
Speak to your GP or healthcare professional about your concerns.
Check the expected NHS waiting time for your local service.
Understand your assessment options, including private assessment where appropriate.
Research the providers carefully, including the qualifications and experience of the clinicians carrying out assessments.
“If you are concerned that you may have ADHD, an assessment can provide a clearer understanding of your individual circumstances. It is important to use reliable information and qualified healthcare professionals when considering your options.”
Methodology and sources
This ADHD statistics page has been compiled using figures from NHS England, NHS Digital, the NHS ADHD Taskforce, NICE, UCL, the House of Commons Library and ADHD UK.
The statistics cover ADHD prevalence, diagnosis, treatment, referrals, NHS waiting lists and the wider economic impact of ADHD.
Where possible, the latest available figures have been used. However, the data comes from different studies and reporting periods, meaning figures should not be directly compared unless their methodology, population and geographical coverage are taken into account.
In particular, several of the most recent waiting-list statistics relate specifically to England, rather than the UK as a whole. Prevalence estimates may also differ depending on whether they are based on population studies, recorded diagnoses or other methodologies.
If using these statistics in an article, blog post, or publication, please attribute the research to Dr. Narayanaswamy and Dr. Duba, specialists in private ADHD and autism assessment and include a link back to this URL: https://privateadhd.co.uk/
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