ATTENTION-DEFICIT/HYPERACTIVITY DISORDER (ADD/ADHD) is a neurological disorder characterized by difficulty sustaining attention, by lack of self-control, and by impaired working memory. ADHD impairs the brain’s prefrontal cortex — which deals with focusing, decision-making, and managing tasks. It is often classified as attention deficit/hyperactivity disorder (ADHD) as well as ADD.
ADHD isn’t an inability to concentrate — it’s an inability to control what to concentrate on. Sometimes the focus is literally on everything at once, and sometimes too much on one thing.
Both children and adults can have the disorder.