ADD-ADHD
Neurodevelopmental Disorders & Learning Differences
What are the three types of ADHD? There are three types of ADHD: Predominantly Inattentive (trouble with attention, focus, and organization), Predominantly Hyperactive-Impulsive (fidgeting, restlessness, and impulsivity), and Combined Type, which includes both symptom groups and is the most commonly diagnosed. The type is defined by which symptoms are most present.
The 3 Types of ADHD at a Glance
| Predominantly Inattentive | Predominantly Hyperactive-Impulsive | Combined Type | |
|---|---|---|---|
| Core pattern | Trouble with attention, focus, and organization | Hyperactivity and impulsivity | Both inattentive and hyperactive-impulsive symptoms |
| Common signs | Forgetful, easily distracted, disorganized | Fidgeting, talking excessively, interrupting | A mix of both symptom groups |
| Also known as | Formerly called “ADD” | — | — |
| Often seen in | Underdiagnosed, especially in girls and adults | Younger children, especially boys | The most commonly diagnosed type |
Authored by: The DrSensory Editorial Team
Reviewed by: 🛡️ DrSensory Clinical Review Board
Last updated: June 2026
Key Takeaways
- There are three official types of ADHD: Predominantly Inattentive Type, Predominantly Hyperactive-Impulsive Type, and Combined Type, classified by the kind of symptoms a person experiences.
- Combined Type ADHD is the most common type and includes both inattentive and hyperactive-impulsive symptoms.
- Predominantly Inattentive ADHD, previously known as ADD, mainly involves struggles with attention and focus rather than hyperactivity, and is often underdiagnosed, especially in girls and adults.
- Predominantly Hyperactive-Impulsive ADHD is a less common subtype where hyperactivity and impulsivity stand out more than attention issues, and it is more often identified in younger children, especially boys.
- Identifying the correct ADHD subtype helps guide treatment options, including therapy, medication, and coping strategies.
Frequently Asked Questions
What are the three types of ADHD?
The three official types are ADHD Predominantly Inattentive Type, ADHD Predominantly Hyperactive-Impulsive Type, and ADHD Combined Type. They are based on the kind of symptoms a person experiences.
Which type of ADHD is the most common?
Combined Type is the most common type of ADHD. It includes both inattentive and hyperactive-impulsive symptoms.
What are the signs of inattentive ADHD in my child?
Common signs include difficulty staying focused on tasks, making careless mistakes in work or school, trouble organizing tasks or belongings, forgetfulness in daily activities, and avoiding tasks that require mental effort for long periods.
Why is inattentive ADHD sometimes missed in girls?
Inattentive ADHD is often underdiagnosed, especially in girls and adults, because it does not involve disruptive behaviors like hyperactivity. With proper support, individuals with inattentive ADHD can learn to manage their symptoms effectively.
Does hyperactive ADHD go away as a child gets older?
While some hyperactive symptoms may lessen with age, impulsivity often persists into adolescence and adulthood. This subtype is more often identified in younger children, especially boys, due to more outward behaviors.
