ADHD is highly heritable. Research summarized by the National Institute of Mental Health and patient resources from CHADD show that genetics account for an estimated 70 to 80 percent of risk, with first-degree relatives of people with ADHD significantly more likely to be affected themselves.
At a neurobiological level, ADHD involves differences in the prefrontal cortex and basal ganglia, regions that govern attention, working memory and impulse control. Dopamine and norepinephrine signaling, the chemical messengers that help the brain prioritize and sustain focus, are often less efficient, which is why standard stimulant and non-stimulant medications target these pathways.
Prenatal and perinatal factors also play a role: prematurity, low birth weight and exposure to alcohol or nicotine during pregnancy increase risk. ADHD frequently coexists with anxiety, learning differences and sleep disorders, which is why a thorough assessment through psychiatric care is essential before any treatment plan is created.
