Can brain structure and function defects cause ADHD?

PostedAugust 18, 2025

UpdatedSeptember 4, 2025

ByMy Patient Advice

Author: Harriet Winslow, BSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

The question of whether brain defects cause ADHD is central to understanding the neurobiological roots of the condition. Research has shown that brain defects causing ADHD can play a significant role in the development of ADHD symptoms, including hyperactivity, impulsivity, and difficulty focusing. These ADHD neurobiological risks are important factors that contribute to the development of the disorder and its associated challenges. In particular, hyperactivity causes ADHD symptoms to be particularly disruptive, affecting daily activities and social interactions.

The prefrontal cortex, responsible for decision-making, attention regulation, and impulse control, is often underactive or develops more slowly in people with ADHD. The basal ganglia, which is involved in motor control and emotional regulation, can also be affected. These brain defects causing ADHD result in challenges with focus, hyperactivity, and impulsivity. The structural and functional differences in these areas explain how hyperactivity causes ADHD behaviours, making it harder to regulate activity levels and control emotional responses.

Common Symptoms of ADHD

Here are some key symptoms linked to brain defects causing ADHD:

Difficulty focusing and completing tasks

People with ADHD may find it hard to maintain focus, particularly on tasks that require sustained attention. This is often due to underactivity in the prefrontal cortex.

Impulsivity and hyperactivity

Symptoms such as fidgeting or impulsive speech are linked to irregularities in the basal ganglia.

Visit providers like ADHD Certify for personal consultations and expert guidance tailored to your unique situation.

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Brain structure and Function.

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.