Understanding the 3 Types of ADHD: Inattentive, Hyperactive-Impulsive & Combined Explained

Authored by: The DrSensory Editorial Team

Reviewed by: 🛡️ DrSensory Clinical Review Board

Last updated: June 2025

All medical content on this page has been reviewed and approved by licensed Doctors on the DrSensory Clinical Review Board. Our reviewers follow strict editorial standards and ensure alignment with current APTA guidelines, evidence-based practice, and orthopedic rehabilitation protocols.

What are the three main types of ADHD?

There are three official types of ADHD (Attention-Deficit/Hyperactivity Disorder), as classified by mental health professionals. These types are based on the kind of symptoms a person experiences:

  • ADHD, Predominantly Inattentive Type: Individuals mainly struggle with attention, organization, and focus. They may seem forgetful, easily distracted, or disorganized.
  • ADHD, Predominantly Hyperactive-Impulsive Type: People show more hyperactivity and impulsive behaviors, such as fidgeting, talking excessively, or interrupting others.
  • ADHD, Combined Type: This is the most common type and includes both inattentive and hyperactive-impulsive symptoms.

Identifying the correct ADHD subtype helps guide treatment options, including therapy, medication, and coping strategies.

What is Predominantly Inattentive Type ADHD?

Predominantly Inattentive ADHD, previously known as ADD (Attention Deficit Disorder), is a type of ADHD where the person mainly struggles with attention and focus, not hyperactivity. Common signs include:

  • Difficulty staying focused on tasks
  • Making careless mistakes in work or school
  • Trouble organizing tasks or belongings
  • Forgetfulness in daily activities
  • Avoiding tasks that require mental effort for long periods

This type is often underdiagnosed, especially in girls and adults, because it doesn’t involve disruptive behaviors like hyperactivity. With proper support, individuals with inattentive ADHD can learn to manage their symptoms effectively.

What is Predominantly Hyperactive-Impulsive Type ADHD?

Predominantly Hyperactive-Impulsive ADHD is a less common subtype where hyperactivity and impulsive actions are more noticeable than attention issues. Symptoms include:

  • Constant fidgeting or restlessness
  • Excessive talking or interrupting conversations
  • Difficulty staying seated in appropriate situations (e.g., classroom)
  • Acting without thinking about consequences
  • Difficulty waiting their turn

This type is more often identified in younger children, especially boys, due to more outward behaviors. While some hyperactive symptoms may lessen with age, impulsivity often persists into adolescence and adulthood.

What is Combined Type ADHD and how is it diagnosed?

Combined Type ADHD is diagnosed when a person shows both inattentive and hyperactive-impulsive symptoms for at least six months. To meet criteria:

  • Six or more inattentive symptoms (e.g., trouble focusing, forgetfulness)
  • Six or more hyperactive-impulsive symptoms (e.g., fidgeting, blurting out answers)
  • Symptoms must interfere with daily life in multiple settings (e.g., home, school, work)

Combined ADHD is the most common type, especially in children and teens. It often requires a multimodal treatment approach, including medication, behavior therapy, and structured support at school or work.

This page provides general educational content and is not a substitute for professional medical advice. Always consult a licensed provider for diagnosis and treatment.

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