The Three Types of ADHD: Inattentive, Hyperactive-Impulsive and Combined
ADHD in the DSM-5 has three presentations, inattentive, hyperactive-impulsive and combined. Here is what separates them, why the label can change over a lifetime, and why it matters for assessment.
ADHD is diagnosed as one of three presentations under the DSM-5: predominantly inattentive, predominantly hyperactive-impulsive, or combined. These are not three different conditions, they are three different symptom patterns of the same underlying condition, and which one applies to you can shift over time as symptoms change.
Predominantly inattentive presentation
In the inattentive presentation, a person is easily distracted but is not notably hyperactive or impulsive, per healthdirect Australia. This is the presentation most likely to be missed or diagnosed late, particularly in girls and women, because it does not disrupt a classroom or workplace the way hyperactivity does. It tends to look like daydreaming, losing track of tasks, or being labelled disorganised rather than obviously restless.
Predominantly hyperactive-impulsive presentation
In the hyperactive-impulsive presentation, the defining symptoms are impulsivity and hyperactivity rather than inattention. This is the presentation most people picture when they think of ADHD: fidgeting, interrupting, difficulty staying seated or waiting a turn. It is also the presentation most likely to be picked up early in childhood, precisely because it is the most visible to a teacher or parent.
Combined presentation
The combined presentation involves a mixture of inattentive and hyperactive-impulsive symptoms, and healthdirect Australia notes it is the most common presentation, and the one most people associate with ADHD generally. A single-clinic Australian study of 68 adults diagnosed with ADHD (referred through GPs between January 2023 and October 2024) found 68 percent received a combined-presentation diagnosis and 32 percent a predominantly inattentive diagnosis, a sample too small to generalise nationally but consistent with combined being the more commonly diagnosed presentation in adults assessed at that clinic.
Why the presentation matters for assessment
A psychologist or psychiatrist assessing you will map your symptoms against all three patterns rather than assuming one from the outset, using the standardised rating scales described in the Australian ADHD clinical practice guideline. The presentation you are diagnosed with can also change over time: hyperactive-impulsive symptoms in particular tend to soften with age even where inattentive symptoms persist, so an adult's presentation is not always the same one they would have received as a child. That is part of why an adult assessment still has to establish that symptoms were present in childhood, even if the specific presentation looked different back then.
Common questions
Can ADHD change from one presentation to another?
Yes. It is common for the balance of symptoms to shift over a lifetime, particularly for hyperactive-impulsive symptoms to soften with age while inattentive symptoms persist, which is why a formal assessment maps current symptoms rather than relying on a childhood label.
Is combined presentation more serious than inattentive presentation?
No, they are different symptom patterns, not different severities. Functional impact depends on the individual, not on which of the three presentations applies.
Sources
- healthdirect Australia: Attention deficit disorder (ADD) or ADHD
- Mendonsa & Jayasooriya, European Psychiatry (2025): adult ADHD wait times at an Australian private clinic
- AADPA: Australian ADHD clinical practice guideline, diagnosis
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