Maybe an aunt once told you “You’re restless just like your cousin.” Or perhaps someone remembers that your grandad was “quirky,” could never sit still, jumped between jobs, and always seemed to be chasing the next thing. Family stories like these often raise a question: does ADHD run in my family?
Modern genetics says there is good reason to notice these patterns. But ADHD is not caused by a single “ADHD gene.” Instead, it appears to arise from a large and complicated mix of genetic differences, combined with developmental and environmental influences.
Research has established that ADHD is polygenic and epigenetic. Polygenic means that it is not a single gene you inherit that causes ADHD, but many genetic differences, each adding a small amount to a person’s likelihood of developing it [1]. Epigenetic means that life experiences and environmental factors can influence how some genes are switched on or off, without changing the DNA itself [2].
Most of the inherited genetic contribution to ADHD comes from thousands of common DNA differences. Each one has an extremely small effect, but together they can shift a person's likelihood of developing ADHD. This also explains why ADHD presentation varies from person to person. A major 2025 genetic analysis found 39 regions of the human genome associated with ADHD, including 17 regions not previously identified [3].
If ADHD runs in a family, it does not mean everyone inherits the same version of it. Twin and family studies consistently show that genes play a large role in ADHD, but they also show that different combinations of genes can contribute to different symptoms.
A 2020 review of twin studies found strong genetic influences on both inattentive and hyperactive traits, while also showing that the genetic pattern varied somewhat depending on which ADHD features were being measured [4]. The review also reported that ADHD often shares genetic influences with other traits and conditions. These include learning difficulties, conduct problems, substance use, autism related traits, emotional problems, and even some physical conditions such as asthma. In simple terms, some of the same inherited factors that increase the likelihood of ADHD may also partly explain why these other difficulties can occur in the same person.
A large Norwegian family study found that similarities in ADHD traits between parents and children were explained mainly by inherited genetic factors, with genetics accounting for about 57% of variation in children’s ADHD behaviours. The study found only a small direct effect of parents’ ADHD-related behaviours on children, suggesting that ADHD tends to run in families largely through genes rather than parenting alone [5].
So, one sibling might mainly struggle to stay focused, while another is noticeably restless and impulsive. A parent may never have received an ADHD diagnosis but remember similar problems at school or work. The family resemblance can be real without being the same for all family members. Genes influence the likelihood and pattern of ADHD, rather than prescribing one fixed version of it. Also, environmental and lifestyle factors can change how your genes respond so it is a bit complicated and scientists are yet to learn more about how these interactions occur. Each one of us is unique in our own way, and that's what the genes say...
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