Attention-Deficit/Hyperactivity disorder (ADHD) Causes Genetic Blood relatives, such as a parent or sibling, with ADHD or another mental health disorder Neural- Dopamine and Noradrenaline are increased Environmental -prenatal exposure to a variety of substances including nicotine, alcohol, prescription medications, and illicit substances. Environmental exposure to lead, organophosphate pesticides Trauma Infection Minimal brain damage Premature birth