“What did I do to cause this?” is one of the first questions many parents — and newly diagnosed adults — ask about ADHD. The reassuring, evidence-based answer is: ADHD is largely something you’re born with, not something anyone caused through choices or lifestyle.
ADHD is strongly genetic
ADHD is one of the most heritable conditions in mental health. It runs in families: if you have ADHD, there’s a good chance a parent, sibling or child does too — often undiagnosed. Many adults first suspect their own ADHD after a child is diagnosed and they recognise themselves in the criteria. This genetic basis is why ADHD is considered neurodevelopmental — part of how the brain is wired from early on.
What’s happening in the brain
ADHD involves differences in how certain brain networks develop and communicate, particularly those governing attention, impulse control and reward. The chemical messenger dopamine plays a key role in motivation and follow-through, which helps explain why “boring but important” tasks can feel almost impossible. These are real, biological differences — not a lack of discipline.
Factors that can raise risk
Alongside genetics, some factors are associated with a higher likelihood of ADHD, including premature birth, very low birth weight, and certain exposures during pregnancy. These influence risk; they don’t tell the whole story, and most cases come down largely to genes.
The myths that don’t hold up
Let’s put some common myths to rest:
- Sugar does not cause ADHD.
- Too much screen time does not cause ADHD (though it can affect sleep and attention generally).
- Bad parenting does not cause ADHD — although a supportive environment helps a child thrive.
- Vaccines do not cause ADHD.
Believing these myths often adds unnecessary guilt. ADHD is nobody’s fault.
What this means for you
Understanding that ADHD is largely genetic and neurological can be freeing — it reframes a lifetime of difficulty as a recognised, treatable condition rather than a personal failing. If ADHD may run in your family, our free ADHD self-check and ADHD assessment are good next steps.
This article is general information, not medical advice.