Is ADHD genetic?
Quick answer: Yes. Family and twin studies show high heritability around 70% to 80%. Large genetic studies identify many common variants with small effects that together increase risk. Genes do not determine outcomes alone; environment, skills, and supports strongly influence daily functioning and outcomes.
Family and twin studies indicate ADHD is highly heritable (often reported in the ~70–80% range in twin studies). Large genome‑wide association studies identify many common variants, each with small effects, that together contribute to risk.
Genes do not determine outcomes alone. Environment, development, and supports matter for daily functioning and well being. Skills, routines, and access to care make a practical difference regardless of genetics.