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What is the heritability percentage of ADHD? 

PostedAugust 18, 2025
UpdatedSeptember 3, 2025
ByMy Patient Advice

The ADHD heritability rate is estimated to be between 70% and 80%, making it one of the most heritable psychiatric conditions. This means that a large portion of the variation in ADHD symptoms across the population can be explained by genetic differences. Studies on twins, families, and genetic sequencing consistently support this high percentage, highlighting that ADHD tends to run strongly in families due to shared genetic material. 

However, heritability doesn’t mean inevitability; environmental and developmental factors also influence whether inherited traits manifest as diagnosable ADHD. 

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What the numbers mean for families 

Here’s how to interpret the genetics behind ADHD. 

ADHD genetic percentage 

When we talk about the ADHD genetic percentage, we’re referring to how much of the condition is linked to genes versus non-genetic factors. With up to 80% of cases showing genetic involvement, it’s clear that inherited traits dominate the risk profile. 

ADHD inheritance rate 

If a parent has ADHD, their child has a 40–60% chance of being diagnosed. This ADHD inheritance rate varies depending on which genetic variants are passed on and how they interact with the child’s environment. 

ADHD family risk 

Multiple family members across generations often share ADHD traits. This ADHD family risk provides a useful indicator for early screening and targeted intervention, especially in children showing early signs of hyperactivity or inattention. 

Understanding the ADHD heritability rate gives families a clearer picture of the condition’s origins and the value of proactive care. Visit providers like ADHD Certify to learn more about genetic screening and personalised ADHD support. 

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

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Lucia Alvarez, MSc, author for my patient advice - mypatientadvice.co.uk

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, author and a reviewer for my patient advice - mypatientadvice.co.uk

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. 

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