Attention Deficit Hyperactivity Disorder (ADHD) is a behavioral and developmental disorder. ADHD is one of the most common childhood neurological disorders and can continue through adolescence and adulthood. Symptoms include difficulty staying focused and paying attention, difficulty controlling behavior, and hyperactivity. It is a chronic condition that affectsmillions of children and often persists into adulthood. Children with ADHD also may struggle with low self-esteem, troubled relationships and poor performance in school.ADHDcan cause significant emotional, social and educational problems. However, whenADHD causes are known early and properly, the condition can be managed effectively, so children can grow up to have productive, successful and fulfilling lives. This review paper summarizes the different causes of this common neurological disorder.