A persistent difficulty in concentrating, remaining still, and working on a task are the key characteristics of

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Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder characterized by persistent difficulties in sustaining attention, impulsivity, and hyperactivity. These difficulties are displayed across various settings such as home, school, and work, and may significantly impact a person's academic, occupational, and social functioning. While some symptoms of ADHD may overlap with those of other conditions, such as mania or obsessive-compulsive disorder, the persistent difficulty in concentrating and remaining still are hallmark features of ADHD. Psychostimulant abuse may also cause difficulty in concentrating, but it is not a clinical disorder. Similarly, while autism may involve challenges with attention and self-regulation, it is typically characterized by more pervasive impairments in social communication and behavior.

A Persistent Difficulty in Concentrating, Remaining Still, and Working on a Task