While symptoms must appear before the age of 12 for a diagnosis, the way they manifest can change significantly as a person ages. ADHD in Children
In young children, ADHD often presents as visible "externalizing" behaviors: While symptoms must appear before the age of
Understanding ADHD: A Lifespan Perspective on Neurodiversity Difficulty sitting still in the classroom (fidgeting or
Adult ADHD often looks different, as individuals develop "masking" strategies or internalize their restlessness: Attention-Deficit/Hyperactivity Disorder (ADHD) Appearing not to listen when spoken to directly
At its core, ADHD is a neurodevelopmental disorder—meaning it affects how the brain develops and functions. It is characterized by persistent patterns of , hyperactivity , and impulsivity that interfere with daily functioning or development.
Difficulty sitting still in the classroom (fidgeting or leaving their seat). Blurting out answers or interrupting others. Frequently losing school supplies or personal items. Appearing not to listen when spoken to directly. ADHD in Adults
: Excessive movement, restlessness, and acting without thinking.