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.
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:
: Excessive movement, restlessness, and acting without thinking.
: Difficulty staying on task, following instructions, and staying organized.
: Symptoms from both of the above categories are present. Symptoms Across the Lifespan
Understanding ADHD: A Lifespan Perspective on Neurodiversity
The presentation of ADHD is typically categorized into three types:
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