Some people mainly have trouble focusing, others struggle with restlessness and impulsive actions, and some experience both. According to the DSM-5, ADHD is categorized into three primary types.

For a diagnosis, children must display at least six symptoms, whereas teenagers and adults need five or more.

These symptoms should be present in more than one setting, such as at home, school, work, or in social situations.

1. Predominantly Inattentive Presentation

This type of ADHD is often overlooked because it doesn’t usually involve obvious hyperactivity.

People may seem calm on the outside but have internal challenges with focus and organization.

Common signs include:

• Omitting details or making many mistakes
• Trouble concentrating or staying on task
• Seeming not to listen, even when directly addressed
• Difficulty finishing tasks or following instructions
• Poor time management and organization skills
• Avoiding tasks that require sustained mental effort
• Frequently losing personal belongings
• Easily distracted by external stimuli
• Forgetting everyday responsibilities

2. Predominantly Hyperactive-Impulsive Presentation

This type is more easily noticed and involves physical restlessness and impulsive behavior.

Individuals may:

• Move around a lot or have trouble staying still
• Feel restless or uncomfortable when sitting still
• Have difficulty participating in quiet or calm activities
• Feel internally restless, especially in adulthood
• Talk a lot
• Interrupt others or answer before a question is fully asked
• Struggle with waiting their turn
• Act without thinking about the consequences

3. Combined Presentation

This is the most common form of ADHD and includes symptoms of both inattention and hyperactivity-impulsivity.

How ADHD Is Diagnosed

To be diagnosed with ADHD:

• These symptoms usually start in childhood, before turning 12
• They must be present in more than one setting
• They affect daily functioning, such as school, work, or relationships
• The symptoms shouldn’t be better explained by another condition

Understanding the different presentations of ADHD can help individuals, parents, and caregivers identify symptoms early and access the right support.