What Is the Difference Between Inattention and Hyperactivity-Impulsivity in DSM-5? 

In the DSM-5, ADHD symptom types are divided into two main categories: inattention and hyperactivity-impulsivity. These categories help healthcare professionals distinguish between the different ways ADHD manifests in individuals. 

Inattention refers to difficulties with focus, organisation, and completing tasks. Individuals with this type of ADHD may struggle to sustain attention, often making careless mistakes, forgetting instructions, or becoming easily distracted by external stimuli. This type of ADHD symptom type primarily affects tasks that require prolonged mental effort, such as reading, homework, or following through on instructions. 

In contrast, hyperactivity-impulsivity is characterised by behaviours such as excessive movement, fidgeting, and difficulty remaining seated. Impulsive actions like interrupting others, speaking out of turn, and difficulty waiting for one’s turn are also hallmark signs of this category. These symptoms often cause disruptions in social and academic settings. 

How It Helps 

The distinction between inattention and hyperactivity-impulsivity helps in identifying the type of ADHD symptom types an individual is experiencing. This distinction is important for tailoring effective treatment strategies, as different symptoms may require different interventions. The symptom categories in the DSM-5 help ensure that ADHD is accurately diagnosed, allowing for better-targeted support and management. By understanding the individual’s specific diagnostic group, treatment plans can be developed to address the most prominent challenges. 

Visit providers like ADHD Certify for personal consultations and expert advice tailored to your needs.   

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to DSM-5 Diagnostic Guidelines.  

Harriet Winslow, BSc

Author

Harriet Winslow is a clinical psychologist with a Bachelor’s in Clinical Psychology and extensive experience in behaviour therapy and developmental disorders. She has worked with children and adolescents with ADHD, autism spectrum disorder (ASD), learning disabilities, and behavioural challenges, providing individual and group therapy using evidence-based approaches such as CBT and DBT. Dr. Winslow has developed and implemented personalised treatment plans, conducted formal and informal assessments, and delivered crisis intervention for clients in need of urgent mental health care. Her expertise spans assessment, treatment planning, and behavioural intervention for both neurodevelopmental and mental health conditions.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the author's privacy.

Dr. Rebecca Fernandez, MBBS

Reviewer

Dr. Rebecca Fernandez is a UK-trained physician with an MBBS and experience in general surgery, cardiology, internal medicine, gynecology, intensive care, and emergency medicine. She has managed critically ill patients, stabilised acute trauma cases, and provided comprehensive inpatient and outpatient care. In psychiatry, Dr. Fernandez has worked with psychotic, mood, anxiety, and substance use disorders, applying evidence-based approaches such as CBT, ACT, and mindfulness-based therapies. Her skills span patient assessment, treatment planning, and the integration of digital health solutions to support mental well-being.

All qualifications and professional experience stated above are authentic and verified by our editorial team. However, pseudonym and image likeness are used to protect the reviewer's privacy.