Attention-Deficit/Hyperactivity Disorder (ADHD) is a brain-based disorder that involves difficulty with paying attention, staying still, and thinking carefully about things ahead of time. Preschool children with ADHD are a lot more hyperactive, impulsive, and inattentive than children who do not have ADHD. This 3-page fact sheet was written by Allie Munch and Heidi Liss Radunovich, and published by the UF Department of Family Youth and Community Sciences, July 2012.
http://edis.ifas.ufl.edu/fy1329