Attention-deficit/hyperactivity disorder (ADHD) is a neurodevelopmental disorder that is characterized by inattention, hyperactivity, and impulsivity. It is a common condition that affects both children and adults.

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Individuals with ADHD may have difficulty paying attention, following through on tasks, organizing tasks and activities, and managing time. They may also be easily distracted and forgetful. In addition, individuals with ADHD may be fidgety, restless, and have difficulty sitting still. They may also act impulsively, interrupt others, and have difficulty waiting their turn.

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There are three types of ADHD: inattentive type, hyperactive-impulsive type, and combined type. Inattentive type ADHD is characterized by difficulty paying attention and staying focused, while hyperactive-impulsive type ADHD is characterized by hyperactivity and impulsivity. Combined type ADHD includes symptoms of both inattention and hyperactivity-impulsivity.