New to ADHD?
A calm introduction to what ADHD is, how it can show up in adults and children, and where to start in Scotland.
Reviewed by ADHD Scot,
What is ADHD?
ADHD (Attention Deficit Hyperactivity Disorder) is a neurodevelopmental condition affecting how the brain regulates attention, impulse control, and activity levels. It is recognised in both children and adults.
ADHD is not a character flaw, a parenting failure, or a lack of effort. It reflects genuine differences in how the brain develops and functions, particularly in areas involved in executive function, working memory, and emotional regulation.
The condition is described in two major diagnostic frameworks: the DSM-5 (Diagnostic and Statistical Manual, used widely in psychiatry) and the ICD-11 (International Classification of Diseases, published by the WHO). ICD-11 classifies ADHD under code 6A05 and brought its criteria closer to DSM-5, a shift from ICD-10, which used the narrower category of "hyperkinetic disorder."
The three presentations
DSM-5 describes three presentations of ADHD:
Predominantly inattentive: difficulty sustaining attention, following through on tasks, organising, and keeping track of things. Often described as "daydreamy." Historically under diagnosed, particularly in girls.
Predominantly hyperactive-impulsive: restlessness, difficulty sitting still, acting or speaking without thinking, interrupting. More likely to be noticed in childhood.
Combined presentation: meeting criteria for both inattentive and hyperactive-impulsive symptoms. The most common presentation in clinical populations.
Presentations can change across a person's life. Someone diagnosed with hyperactive-impulsive ADHD in childhood may present more inattentively as an adult.
How ADHD shows up in adults
In adults, ADHD often looks quite different from the textbook picture of a restless child. Common experiences include:
- Time blindness: difficulty sensing how much time has passed or how long tasks will take
- Executive dysfunction: struggling to start tasks, switch between them, or hold multiple steps in mind at once
- Emotional dysregulation: feelings that arrive suddenly and at full intensity, often described as rejection sensitive dysphoria (RSD)
- Hyperfocus: the ability to become intensely absorbed in things that hold interest, sometimes to the exclusion of everything else
- Chronic underachievement: a persistent sense of not reaching your potential despite obvious capability
- Disorganisation: losing things, missing appointments, struggling with routines
Many adults reach diagnosis only after years of being told they were lazy, careless, or "not trying hard enough." This is particularly common for women and people who were high-achieving students, where years of compensation kept it hidden. The cognitive effort of sustaining that mask can contribute to burnout in work, relationships, and daily life.
How ADHD shows up in children
In children, ADHD is more commonly recognised, though girls and quieter children are still frequently missed. Signs vary by age.
In younger children, hyperactivity and impulsivity are often more visible: difficulty waiting, interrupting, physical restlessness. In older children and teenagers, inattentiveness, disorganisation, and emotional difficulties may be more prominent.
A child who is quiet, compliant, and struggles to follow instructions or finish work may have inattentive ADHD that goes unrecognised for years.
How ADHD shows up in women and girls
For most of its clinical history, ADHD research focused almost entirely on boys. The restless, disruptive child who could not sit still became the image that shaped how clinicians were trained to recognise it. Women and girls who did not fit that picture were not referred, or were told they were anxious, scattered, or just not very organised.
Many women are now reaching an ADHD diagnosis in their thirties and forties, having spent decades wondering why everything felt harder than it seemed to for other people.
Inattentive presentation is more common in women
Women are significantly more likely than men to have inattentive ADHD rather than the hyperactive-impulsive type. Inattentive ADHD is quieter. It does not produce the behaviours that get a teacher's attention. Instead it looks like losing things constantly, forgetting appointments, starting many things and finishing few, and feeling like you are always behind no matter how hard you try.
A 2020 expert consensus statement led by researchers at King's College London found that inattentive ADHD in women is consistently underrecognised in primary care, partly because it does not match the stereotypical picture and partly because women have often developed sophisticated ways of compensating by the time they seek help. (Young S, Adamo N, Ásgeirsdóttir BB, et al. Females with ADHD: An expert consensus statement. BMC Psychiatry, 2020.)
Masking
Many women with ADHD describe putting enormous effort into appearing organised and on top of things. This might mean arriving early everywhere to reduce the anxiety of being late, keeping elaborate lists and systems to compensate for working memory difficulties, or spending hours preparing for something so that the gaps in their attention are not visible.
This often works well enough that the ADHD goes undetected for years, including by the person themselves. But it is costly. The energy spent maintaining that performance can leave very little for anything else, and is associated with burnout over time.
Emotional intensity
Rejection sensitive dysphoria is not a formal diagnostic criterion, but it is one of the most commonly reported and most disabling aspects of ADHD for many women. It describes an intense, sudden emotional reaction to real or perceived criticism, rejection, or failure. It can feel wildly out of proportion to the situation, and it can arrive before there is any time to think.
Women with undiagnosed ADHD are sometimes diagnosed with anxiety, depression, or borderline personality disorder, when ADHD-related emotional dysregulation may be part of the picture.
Why women are diagnosed late
A 2012 study found that clinicians presented with identical symptom descriptions were significantly more likely to assign an ADHD diagnosis to a boy than a girl with the same presentation. (Bruchmüller K, Margraf J, Schneider S. Is ADHD diagnosed in accord with diagnostic criteria? Journal of Consulting and Clinical Psychology, 2012.)
The diagnostic criteria were largely shaped by research on hyperactive boys. Both the NICE clinical guideline for ADHD (NG87, updated 2019) and the Royal College of Psychiatrists' guidance on ADHD in adults (CR235, 2023) specifically note the need for clinicians to consider how ADHD presents differently in women and girls.
If you are a woman whose symptoms have been attributed to anxiety or depression without much improvement, it is worth raising ADHD directly with your GP. Our ADHD in women page goes into this in much more detail.
ADHD and autism
ADHD and autism frequently co-occur. Estimates vary by how they are measured, but studies commonly find that around half of autistic people also meet criteria for ADHD, and that many people with ADHD show autistic traits (expert consensus, Young et al., 2020). The two conditions share some features but are distinct, and being assessed for one does not rule out the other.
If you or your child has received one diagnosis and you feel something else is being missed, it is reasonable to raise this with your GP or assessing clinician.
The neurodiversity community uses the term "AuDHD" to describe having both ADHD and autism. It is not a formal clinical diagnosis, but it captures something that clinical language often misses: living with both is a distinct experience, not simply two conditions added together. It can mean a constant internal duality: a push and pull between contradictory needs and ways of experiencing the world.
What to look for in a private ADHD assessment
Not all private assessments are equal. A thorough assessment should involve more than a questionnaire and a short conversation. Here are the tools you may encounter and why they matter.
DIVA 2.0 or DIVA-5 (Diagnostic Interview for ADHD in Adults): a structured interview that works through the DSM criteria systematically, looking at both current symptoms and childhood history. Designed to be done with someone who knows you if possible. This is one of the most widely used adult ADHD diagnostic interviews in the UK.
Conners scales: standardised rating scales that measure ADHD symptoms across different settings. The Conners Adult ADHD Rating Scales (CAARS) are completed by you, and ideally also by someone who knows you well, which provides a more complete picture than self-report alone.
ASRS-5 (Adult ADHD Self-Report Scale): a five-question validated screener developed with the WHO. Not a diagnostic tool on its own, but widely used as a starting point.
QbTest: a computerised test that measures attention, impulsivity, and physical movement simultaneously over about 20 minutes. It produces an objective report compared against age and gender norms. NICE reviewed it as a clinically useful aid in ADHD assessment (not a standalone diagnostic tool, but it adds an objective layer that self-report cannot). Some private providers in Scotland use it; you can filter for this on our compare tool.
WFIRS (Weiss Functional Impairment Rating Scale): a questionnaire that measures how ADHD affects daily life across six domains: family, work, school, social activities, self-concept, and everyday tasks. Unlike tools that focus on symptom frequency, WFIRS asks about functional impact: what you actually struggle to do, and how much it affects your life. This is particularly relevant for women, whose ADHD may cause significant impairment in areas like relationships, home management, and self-care even when core symptoms are less visible to an observer. It is available as a self-report version (WFIRS-S) and is commonly used in both assessment and ongoing monitoring.
A good assessment should draw on more than one source of information, not rely entirely on what you say about yourself in the room. Collateral information from a partner, parent, or colleague who has known you across different settings adds real weight to the picture.
Preparing for an ADHD assessment
Going into an assessment with some preparation makes a real difference to what the clinician can learn about you, and to how confident you feel in the room.
Think about childhood. ADHD has to have been present since childhood, even if it was not recognised. Think back to primary school: did you struggle to finish work, lose things constantly, find it hard to sit still or wait your turn? Did teachers describe you as dreamy, disruptive, or inconsistent? Write some of this down before you go.
Bring examples, not just descriptions. Saying "I struggle with time" is less useful than saying "I have missed three important deadlines in the past year, and I regularly arrive late despite leaving with plenty of time." Concrete examples help clinicians understand the real impact.
Ask someone who knows you to give their view. Most good assessments include collateral information, either through a rating scale completed by someone else or a brief conversation. If a partner, parent, or close friend is willing to contribute, this is worth arranging in advance.
Write down your questions. Assessments can feel rushed, and it is easy to forget things you wanted to ask. A short list of questions gives you something to refer back to.
You do not need to perform. Some people worry that they will seem too organised in the assessment room and the clinician will not believe them. A good clinician understands that ADHD presents inconsistently, and that the effort of preparing for an appointment is itself a symptom of the condition.
Trusted further reading
- NHS Inform, ADHD: NHS Scotland's public-facing overview
- ADHD Scotland: Scotland's dedicated ADHD charity, with resources, support groups, and Scotland-specific guidance
- NHS Scotland Right Decisions, ADHD guidance: NHS Scotland's operative clinical and prescribing guidance
- NICE guideline NG87, ADHD: diagnosis and management: the clinical guideline for England and Wales; relevant context for Scotland
- ADHD UK: a UK charity with accessible information and community support
- Royal College of Psychiatrists, ADHD: clinician-produced information for the public
Reviewed by ADHD Scot,