Quit & Win

International Quit&Win Coordinating Centre — National Public Health Institute (KTL), Finland

Mannerheimintie 166, FIN-00300 Helsinki, Finland
The Quit&Win project is supported by WHO.

2–29 May 2004

Is ADHD Genetic From Mother or Father? What Research Shows

ADHD is genetic from both mother and father, with no evidence that one parent contributes more risk than the other. Heritability estimates range from 70% to 80%, meaning genes play a major role, but the condition is polygenic and influenced by many small genetic effects from both sides of the family. Environmental factors also contribute, but the intergenerational transmission of ADHD is primarily genetic.

If you are wondering whether your child's ADHD came from you or your partner, the answer is likely both. Research shows that ADHD runs in families, but it does not follow a simple dominant or recessive pattern. Instead, many genes, each with a small effect, combine to increase susceptibility. This article explains what scientists know about the genetic origins of ADHD, how it is passed down, and what this means for families.

How Heritable Is ADHD?

ADHD is one of the most heritable psychiatric conditions. Twin studies consistently show that genetic factors account for about 70% to 80% of the variation in ADHD traits in the population. A major review by Faraone and Larsson estimated heritability at approximately 74%. This means that in a given population, most of the differences in ADHD symptoms can be attributed to genetic differences between individuals.

Heritability does not mean that 74% of a person's ADHD is caused by genes. It is a population-level statistic that describes how much of the variation in a trait is due to genetic variation. For an individual, ADHD results from a complex interplay of many genes and environmental influences. You can also explore Where to Get Tested for ADHD Near You for a closer comparison.

Does ADHD Come More From the Mother or Father?

No, ADHD is not inherited more from one parent. Both parents contribute equally to the genetic risk. A common misconception is that ADHD is passed down primarily from the mother, perhaps because mothers are often the ones who seek help for their children or because maternal ADHD may be more likely to be diagnosed when a child is evaluated. However, genetic studies do not support a stronger maternal or paternal effect.

A 2022 study by Agnew-Blais and colleagues specifically examined whether mothers' ADHD genetic risk influenced children's ADHD beyond the genes they passed on (a phenomenon called "genetic nurture"). They found no evidence of genetic nurture from mothers; the association between maternal and child ADHD was fully explained by the genes the child inherited. This suggests that the mother's ADHD status does not have an additional environmental effect on the child's ADHD risk.

Similarly, a large Norwegian study using a children-of-twins-and-siblings design found that the correlation between parent and child ADHD behaviors was primarily due to additive genetic transmission. The correlation between mothers' and children's ADHD symptoms was 0.24, and between fathers' and children's was 0.10. While the mother-child correlation was higher, this difference likely reflects that mothers were the ones reporting on both their own and their child's symptoms, leading to shared method variance. The study concluded that genetic transmission, not environmental transmission, explained the intergenerational resemblance.

What Is the Role of Genetic Nurture?

Genetic nurture refers to the idea that a parent's genes can influence a child's environment, which in turn affects the child's development. For example, a parent with ADHD-related genes might create a more chaotic home environment, which could exacerbate ADHD symptoms in the child. However, research suggests that genetic nurture plays a minimal role in ADHD.

The 2022 study mentioned above found no evidence of genetic nurture from mothers. A 2025 study reported in Psychiatric News found that 66% of a child's risk for ADHD was due to direct genetic inheritance from parents, with only a small portion attributable to genetic nurture or environmental transmission. This indicates that while the environment matters, the primary pathway from parent to child is through the genes themselves.

Can ADHD Skip a Generation?

Yes, ADHD can appear to skip a generation, but this is not because a single "ADHD gene" is recessive. ADHD is polygenic, meaning many genes contribute small effects. A person may inherit some ADHD-related genetic variants but not enough to meet the diagnostic threshold or experience significant impairment. That person can still pass those variants to their children, who may inherit a different combination that results in ADHD.

Additionally, ADHD is often underdiagnosed in adults, especially women. A parent may have undiagnosed ADHD and not realize it until their child is diagnosed. This can create the impression that ADHD skipped a generation when, in fact, it was present but unrecognized.

What Environmental Factors Influence ADHD?

While genetics play a major role, environmental factors also contribute to ADHD risk. These include prenatal exposures (such as maternal smoking, alcohol use, or stress during pregnancy), low birth weight, lead exposure, and early childhood adversity. However, these factors generally have smaller effects than genetics.

It is important to note that environmental factors can interact with genetic susceptibility. A child with a high genetic risk for ADHD may be more sensitive to environmental stressors, while a child with low genetic risk may be resilient. This gene-environment interaction is an active area of research.

What Does This Mean for Families?

If you or your partner has ADHD, your child has a higher risk of developing ADHD, but it is not a certainty. Studies of children of parents with ADHD have found that over 40% may develop ADHD themselves, but this means many do not. The risk is higher if both parents have ADHD.

Knowing that ADHD is highly heritable can help families recognize symptoms early and seek appropriate support. Early intervention, behavioral therapy, and educational accommodations can significantly improve outcomes. If you suspect your child may have ADHD, consult a healthcare professional for a comprehensive evaluation.

Remember that ADHD is a neurodevelopmental condition, not a result of poor parenting. Understanding its genetic basis can reduce stigma and encourage a proactive approach to management.

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