There are 3 officially recognised types of ADHD defined by the DSM-5. Some researchers also describe up to 7 subtypes. This guide explains all of them, how they differ, and what each means for daily life.
The answer depends on which framework you are using. According to the DSM-5-TR, the diagnostic manual used by clinicians in the UK, USA, and most of the world, there are 3 official types of ADHD. These are the presentations recognised for diagnostic purposes and the ones your doctor or psychiatrist will use when assessing you or your child.
However, some researchers, most notably the neuropsychiatrist Dr Daniel Amen, have proposed a broader model identifying 7 types of ADHD based on brain imaging research. While this model is not part of the official DSM-5 diagnostic criteria, it has gained significant attention and some clinicians find it useful in understanding why the same diagnosis can look so different from person to person.
This page covers both frameworks clearly so you can understand the full picture.
Important: Only the 3 DSM-5 types are used for formal clinical diagnosis. The 7 subtypes are a research-based model that may help explain treatment responses and symptom variations, but they are not official diagnostic categories recognised by the APA, NHS, or equivalent bodies.
The American Psychiatric Association's DSM-5-TR defines three presentations of ADHD. The type assigned at diagnosis reflects which category of symptoms is most prominent over the preceding six months. Importantly, a person's presentation can change over time, meaning the type of ADHD they are diagnosed with in childhood may differ from their presentation in adulthood.
This type is characterised primarily by symptoms of inattention, with few or no signs of hyperactivity or impulsivity. It is the presentation most commonly missed, particularly in girls and women, because it does not produce the disruptive classroom behaviour associated with the stereotypical image of ADHD. People with inattentive ADHD are often described as dreamy, quiet, disorganised, or scattered rather than disruptive or hyperactive.
For a diagnosis in adults (17 and over), at least 5 of the following symptoms must be present consistently for more than 6 months, be inappropriate for the person's developmental level, and cause meaningful impairment in at least two settings.
This type is characterised primarily by symptoms of hyperactivity and impulsivity. People with this presentation are often noticed early, particularly in school settings, because their behaviour is visible and frequently disruptive. Hyperactivity often decreases with age, but impulsivity frequently persists into adulthood and can have significant consequences in relationships, finances, and professional life.
For adults, at least 5 of the following symptoms must be consistently present for more than 6 months and cause impairment across multiple settings.
Combined type ADHD is diagnosed when a person meets the criteria for both inattentive and hyperactive-impulsive presentations. It is the most common overall diagnosis, particularly in children. People with combined type ADHD experience significant challenges across both domains simultaneously, making daily life considerably more demanding than when only one presentation is present.
For adults, at least 5 symptoms from each of the two categories must be consistently present for more than 6 months and cause meaningful impairment in multiple settings. Children require 6 or more symptoms from each category.
The model of 7 ADHD subtypes was developed by Dr Daniel Amen, a neuropsychiatrist and brain imaging specialist, based on SPECT (single-photon emission computed tomography) brain scans from thousands of patients. His research suggested that while all 7 types share core ADHD features, they differ in the specific brain patterns involved, which has implications for which treatments work best for each individual.
This framework is not part of official clinical diagnostic criteria and remains outside the mainstream diagnostic consensus. However, it is widely discussed because it helps explain why standard ADHD treatments do not work equally well for everyone, and why the same diagnosis can look so different across individuals.
The most recognisable presentation. Characterised by inattention, hyperactivity, impulsivity, disorganisation, and short attention span. This corresponds closely to the DSM-5 combined type. Typically responds well to stimulant medication.
Low activity in the prefrontal cortex without the hyperactivity component. People are often described as spacey, easily bored, unmotivated, or slow-moving. More common in girls. This aligns with the DSM-5 inattentive type.
Difficulty shifting attention between tasks. People get locked onto thoughts or behaviours and struggle to let go. Often accompanied by worry, inflexibility, and oppositional behaviour. Standard stimulants may worsen symptoms.
Combines core ADHD features with temporal lobe dysfunction. Characterised by memory problems, mood instability, irritability, and in some cases aggressive thoughts or behaviours. Often requires anticonvulsant or mood-stabilising medication alongside ADHD treatment.
Core ADHD features alongside persistent mild depression, low energy, low self-esteem, and negative thinking. The limbic system, which regulates mood and emotion, shows increased activity. Stimulants alone may not be sufficient.
Characterised by hypersensitivity to stimuli, hyperfocus, mood instability, talkativeness, and oppositional behaviour. Brain scans show increased activity across multiple regions. Often misdiagnosed as bipolar disorder. Stimulants frequently worsen symptoms.
Core ADHD features alongside significant anxiety, tension, nervousness, and physical stress symptoms. People with this type may predict worst-case outcomes and freeze under pressure. Non-stimulant treatments and therapy are often more appropriate than stimulants alone.
Why does the 7-type model matter? If standard ADHD medication has not worked well for you or someone you know, it may be because the presentation does not fit the classic type that stimulants are most effective for. Speaking with a specialist who takes a comprehensive view of your full symptom profile can make a significant difference to treatment outcomes.
While all three official types of ADHD share the same core neurological basis, they present very differently in daily life. Understanding the distinctions helps with both recognition and treatment.
| Feature | Inattentive | Hyperactive-Impulsive | Combined |
|---|---|---|---|
| Primary symptoms | Attention and organisation | Restlessness and impulsivity | Both equally |
| Visibility | Often subtle and missed | Noticeable and disruptive | Highly noticeable |
| More common in | Girls and women | Boys and younger children | Boys, most common overall |
| Often diagnosed | Late, in adolescence or adulthood | Early, in primary school | During school years |
| Mistaken for | Anxiety, laziness, daydreaming | Behavioural problems | Multiple conditions |
| Adults: hyperactivity | Usually absent | Often reduces with age | Reduces but impulsivity persists |
| Co-occurring conditions | Anxiety, depression, low self-esteem | ODD, conduct disorder | Anxiety, ODD, learning difficulties |
There is no single test for ADHD. Diagnosis is a clinical process carried out by a qualified healthcare professional, such as a consultant psychiatrist, clinical psychologist, or specialist nurse practitioner. The type of ADHD assigned reflects which symptoms predominate over at least a six-month period.
A comprehensive assessment will typically include:
It is important to note that a person's type of ADHD can change over time. A child diagnosed with combined type may present primarily as inattentive in adulthood as hyperactivity diminishes. Clinicians will reassess presentations at follow-up to ensure the diagnosis and treatment plan remain appropriate.
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All three official types of ADHD are treated using broadly similar approaches, though the specific combination of interventions may differ depending on the presentation, the individual's age, and any co-occurring conditions. This is one of the reasons some clinicians find the 7-type model useful, as it can help explain why certain patients respond poorly to first-line stimulant medication.
Our 100-question assessment covers all 20 ADHD symptom domains, giving you a detailed breakdown of your attention profile across inattention, hyperactivity, impulsivity, emotional regulation, and more.
Start Your Assessment for £2.99 →At Attention Deficit Test, our ADHD resource library covers every aspect of ADHD, from understanding symptoms and types to navigating diagnosis, treatment, and related conditions.