Attention Deficit Hyperactivity Disorder (ADHD) is also known as Childhood Hyperactivity Syndrome. ADHD is characterized by age-inappropriate distractibility, excessive activity and emotional impulsivity, accompanied by cognitive deficits and learning difficulties, but the child’s intelligence is normal or close to normal. ADHD is common in school-age children, but 70% of children with ADHD will continue to have symptoms into adolescence, and 30% into adulthood, and ADHD develops into youth with antisocial behavior and personality problems. ADHD develops into youth with antisocial behavior and personality problems. It is now widely recognized by child psychiatrists that ADHD is a chronic disorder with lifelong consequences. The cause of ADHD is extremely complex, and it is a syndrome caused by a variety of biological, psychological and social factors acting alone or in concert. It is actually a disease of the brain, not just a manifestation of behavior, a change that occurs within a child’s brain. Biologically, research over the years has suggested that ADHD may be genetically predisposed, and that children of parents with psychological problems, such as depression, anxiety, or emotional problems, have a significantly higher prevalence of ADHD than children of psychologically healthy parents.