How do genetic polymorphisms influence ADHD severity?

PostedAugust 18, 2025

UpdatedSeptember 3, 2025

ByMy Patient Advice

Author: Lucia Alvarez, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

Variations in DNA known as genetic polymorphisms can significantly impact the intensity and type of symptoms seen in ADHD. In the case of genetic polymorphisms of ADHD, these subtle differences in gene sequences can affect how neurotransmitters like dopamine and norepinephrine function, leading to differences in attention span, impulse control, and emotional regulation. While no single polymorphism causes ADHD, a collection of them may contribute to greater or lesser ADHD severity.

These inherited genetic variations help explain why ADHD manifests differently from one individual to another, even within the same family.

Understanding genetic variation in ADHD

Here’s how these genetic differences shape ADHD outcomes.

ADHD severity

Some polymorphisms are associated with more intense symptoms, such as chronic impulsivity or emotional dysregulation. These patterns may also make individuals more likely to experience comorbid conditions like anxiety or learning difficulties.

Genetic variation

Genetic variation influences how well certain brain circuits function, especially those governing reward, attention, and inhibition. These variations also affect how individuals respond to medications, making personalised treatment increasingly important.

By studying genetic polymorphisms in ADHD, researchers aim to better predict which children or adults might benefit from specific therapies. Visit providers like ADHD Certify for insights into how your genetic makeup might influence care decisions.

For a deeper dive into the science, diagnosis, and full treatment landscape, read our complete guide to Genetic Factors in ADHD.

Lucia Alvarez, MSc

Author

Lucia Alvarez is a clinical psychologist with a Master’s in Clinical Psychology and extensive experience providing evidence-based therapy and psychological assessment to children, adolescents, and adults. Skilled in CBT, DBT, and other therapeutic interventions, she has worked in hospital, community, and residential care settings. Her expertise includes grief counseling, anxiety management, and resilience-building, with a strong focus on creating safe, supportive environments to improve 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 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.