How Much of ADHD is Genetically Inherited?

PostedOctober 7, 2025

UpdatedOctober 10, 2025

ByMy Patient Advice

Author: Victoria Rowe, MSc | Reviewed by: Dr. Rebecca Fernandez, MBBS

ADHD is widely recognized as a neurodevelopmental disorder with a strong genetic component. Heritability studies suggest that a significant portion of ADHD is inherited, with genetics playing a crucial role in its development. While environmental factors and lifestyle choices also contribute to the condition, research indicates that genetic risk accounts for a substantial part of ADHD’s onset and severity.

Genetic Risk and Inherited Traits

Studies have shown that ADHD heritability is high, with estimates suggesting that genetics contributes to approximately 70-80% of ADHD cases. Family studies consistently demonstrate that ADHD tends to run in families, meaning individuals with a first-degree relative, such as a parent or sibling, with ADHD are more likely to develop the disorder themselves. Specific genetic traits linked to ADHD include variations in genes responsible for dopamine regulation, such as the DAT1 gene, which codes for the dopamine transporter.

Family Studies and Evidence of Heritability

Family studies have provided strong evidence of ADHD’s inherited nature, showing that children with ADHD are significantly more likely to have parents or siblings with the same condition. Twin studies further support this, revealing that identical twins are more likely to both have ADHD compared to fraternal twins. This suggests a genetic predisposition that is stronger than environmental influences alone.

Conclusion

While genetic inheritance plays a major role in the development of ADHD, it is not the sole factor. Environmental factors, such as prenatal care and early childhood experiences, can influence the expression of ADHD. However, the high degree of genetic risk emphasizes the importance of family history and provides insight into potential genetic predispositions for ADHD.

Visit providers like ADHD Certify for personal consultations to explore the genetic and family-related aspects of ADHD.

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

Victoria Rowe, MSc

Author

Victoria Rowe is a health psychologist with a Master’s in Health Psychology and a BS in Applied Psychology. She has experience as a school psychologist, conducting behavioural assessments, developing individualized education plans (IEPs), and supporting children’s mental health. Dr. Rowe has contributed to peer-reviewed research on mental health, including studies on anxiety disorders and the impact of COVID-19 on healthcare systems. Skilled in SPSS, Minitab, and academic writing, she is committed to advancing psychological knowledge and promoting well-being through evidence-based practice.

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.