Is the expression of ADHD-related genes different in males and females?

PostedAugust 19, 2025

UpdatedSeptember 4, 2025

ByMy Patient Advice

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

Yes, research reveals that ADHD gene expression by gender differs between males and females, reflecting distinct biological mechanisms in symptom development and presentation. This gender-specific expression helps explain why ADHD often looks different between boys and girls, and why diagnosis and treatment should be sensitive to sex-based biological differences, including genetic dimorphism.

How gender influences ADHD gene activity

Gene expression patterns in ADHD are not identical across sexes. Here’s how differences emerge and what they mean.

Genetic dimorphism and symptom profile

Some ADHD-related genes express more strongly in males or females due to hormonal and chromosomal differences. This genetic dimorphism can influence core symptoms, like hyperactivity in boys and internalised inattentiveness in girls.

Sex-based variation in brain development

Beyond genes alone, boys and girls experience different brain maturation timelines. These sex-based variations, driven partly by gene expression, affect areas linked to attention, impulse control, and emotional regulation.

Epigenetics shaping gender differences

Epigenetic mechanisms, how environmental factors toggle gene activity, play a role in epigenetics by modulating gene expression locked into sex-specific patterns. This helps explain how life experiences differently influence ADHD traits in males and females.

An awareness of ADHD gene expression by gender supports more effective, personalised evaluation and care. Visit providers like ADHD Certify for gender-informed genetic and behavioural assessments.

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.