ADHD is a neurodevelopmental condition, which means it is present from childhood rather than something that develops in adulthood. What has changed is not the number of people who have it — it is the number being recognised.
Why the numbers are rising
Three things are happening at once.
The first is diagnostic catch-up. For decades, ADHD was understood through the template of a hyperactive boy disrupting a classroom. Anyone who did not fit that picture — girls, quiet children, people who compensated well academically — was simply missed. Those people are now adults, and they are being assessed.
The second is awareness. Social media has done something genuinely useful here, even accounting for the oversimplification: it has shown people that traits they assumed were personal failings have a name and a literature.
The third is that services have not scaled. NHS ADHD assessment waiting times in parts of the UK now run into years, which is why a large private assessment sector has grown alongside.
Why women are diagnosed so late
Women are diagnosed with ADHD substantially later than men, often not until their thirties or forties, and frequently after a child is diagnosed first.
Part of this is presentation. The inattentive form — disorganisation, difficulty sustaining focus, mental restlessness rather than physical — is more common in women and far less disruptive to other people, so it generates fewer referrals. Part of it is masking: developing elaborate compensatory systems that hold until a life change overloads them.
A 2025 review in Frontiers in Global Women's Health on female ADHD across the lifespan makes the point that diagnostic practice and sociocultural factors both contribute to delay, and that the delay itself carries cost — undiagnosed women show higher rates of associated difficulties, and the review notes markedly elevated premenstrual depressive symptoms compared with the general population.
What ADHD actually looks like in adults
Adult presentation is rarely the childhood stereotype. More commonly:
- Difficulty starting tasks that are not urgent or interesting, regardless of how much you want to do them
- Time blindness — genuine difficulty estimating how long things take
- Emotional dysregulation, including intense reactions to perceived rejection
- Hyperfocus, which is not the opposite of attention deficit but part of the same dysregulation
- Working memory problems that look like carelessness from outside
Notably, the diagnostic criteria require symptoms present before age 12 and causing impairment in more than one setting. Recognising yourself in a list is not a diagnosis.
What the guidance says about assessment and treatment
NICE guideline NG87 covers ADHD diagnosis and management in the UK. A diagnosis must be made by a suitably qualified clinician — a psychiatrist, specialist nurse, or other appropriately trained professional — through a full clinical assessment, not a questionnaire alone.
For adults, NICE recommends medication as first-line treatment where ADHD is causing significant impairment, alongside environmental modifications. It also recommends that non-pharmacological support such as CBT be offered where medication is declined, ineffective, or partially effective.
If you are waiting for an NHS assessment, it is worth knowing about Right to Choose in England, which in many cases allows you to select an alternative provider for your first appointment.
Sources
- National Institute for Health and Care Excellence. Attention deficit hyperactivity disorder: diagnosis and management. NICE guideline NG87.
- NHS. Attention deficit hyperactivity disorder (ADHD). nhs.uk — symptoms, diagnosis and treatment.
- Research advances and future directions in female ADHD: the lifelong interplay of hormonal fluctuations with mood, cognition, and disease. Frontiers in Global Women's Health, 2025. PubMed Central, PMC12277363.