Is Inattentive ADHD Hereditary?

Inattentive ADHD often runs in families, raising the question: is ADHD, specifically the inattentive type, ADHD hereditary? The short answer is yes. Both research and clinical experience show that hereditary ADHD is common, and ADHD genetics play a major role in the development and presence of this condition across generations.

If you’ve noticed signs of inattentiveness, disorganisation, or forgetfulness in multiple relatives, it may reflect a broader ADHD family history.

What We Know About ADHD and Genetics

Research by “The UK’s National Institute for Health and Care Excellence (NICE) explicitly states that “the mean heritability of ADHD demonstrated in twin studies is 76% shows that ADHD genetics account for a large proportion of the condition’s development.

A 2020 review published in Frontiers in Psychiatry and a 2019 review in Biological Psychiatry both note heritability ADHD is approximately 70–80% heritable, making it one of the most genetically influenced neurodevelopmental disorders.

The results of twin and family studies support the notion that there is a significantly higher likelihood of ADHD in other family members when one has it. A strong ADHD family history can become apparent once one person is diagnosed, especially when others exhibit similar characteristics like distractibility or impulsivity.

Can Inattentive ADHD Be Passed Down?

Yes, inherited ADHD often includes the inattentive subtype. Unlike hyperactivity, inattentive traits can be subtle and long overlooked. In many cases, ADHD in parents goes undetected until their child receives a diagnosis and they recognise familiar patterns.

Parents with inattentive ADHD may appear forgetful, mentally exhausted, or disorganised, without knowing these behaviours stem from a neurodevelopmental condition. It’s important to understand this is not about poor parenting or lack of discipline, it’s biological, not behavioural.

Final Thoughts

Inattentive ADHD has a strong genetic basis, and recognising it can offer insight, relief, and direction. If multiple family members experience similar focus, memory, or organisation challenges, consider seeking an ADHD assessment.

Knowing the role of hereditary ADHD helps remove shame and promotes early support. Try to explore ADHD subtypes and parenting resources for ADHD families for better understanding.