ADHD, short for Attention Deficit Hyperactivity Disorder, is a frequently occurring neurodevelopmental condition that impacts attention and behavior. For instance, people with ADHD are more easily distracted than people who don�t have it. ADHD can make it harder to focus, listen well, wait, or take your time. ADHD, once considered predominantly a childhood disorder, is now recognized as a common behavioral condition that can persist into adulthood.