Written by the Fiveable Content Team • Last updated September 2025
Verified for the 2026 exam
Verified for the 2026 exam•Written by the Fiveable Content Team • Last updated September 2025
Definition
ADHD (Attention-Deficit/Hyperactivity Disorder) is a neurodevelopmental disorder characterized by persistent patterns of inattention, impulsivity, and hyperactivity that can interfere with daily functioning and development.
Related terms
Inattention: Inattention refers to the difficulty in sustaining attention on tasks or activities, often accompanied by frequent distractions and forgetfulness.
Hyperactivity: Hyperactivity involves excessive motor activity and an inability to sit still for extended periods. It is one of the core symptoms of ADHD.
Impulsivity refers to acting without thinking about potential consequences. Individuals with ADHD may exhibit impulsive behaviors such as interrupting others or taking risks without considering the outcomes.