Which of the following symptoms is characteristic of Attention-deficit/hyperactivity disorder (ADHD)?

ADHD is characterized by a persistent pattern of inattention, hyperactivity, and impulsivity that interferes with functioning or development. The symptoms can manifest in various ways, including difficulty sustaining attention in tasks, fidgeting or squirming, interrupting others, and an inability to wait one's turn.

This combination of hyperactivity, impulsivity, and inattention is foundational to the diagnosis of ADHD. It affects the individual’s ability to perform in school and social situations, making it crucial to recognize this symptom triad for appropriate diagnosis and management.

The other symptoms listed, such as an excessive need for sleep, severe separation anxiety, and social withdrawal, while important in their own right, are not characteristic of ADHD. They may be associated with other psychiatric conditions, but they do not define the behavioral profile typical of ADHD. Understanding these distinctions aids greatly in accurately identifying and addressing ADHD in clinical practice.