What is the hallmark of attention deficit hyperactivity disorder in adults?

Difficulty concentrating is a hallmark symptom of attention deficit hyperactivity disorder (ADHD) in adults. While adults with ADHD may exhibit symptoms such as impulsivity, restlessness, and hyperactivity, it is often the difficulties with focus and maintaining attention that can create significant challenges in daily activities. This can manifest in various ways, including trouble completing tasks, forgetfulness, and a propensity for distraction.

Understanding this symptom is crucial because it affects various aspects of life, such as work and relationships. Adults may struggle to stay organized and prioritize tasks, leading to chronic disorganization, but the core issue often revolves around their ability to concentrate effectively. By recognizing difficulty concentrating as a primary symptom, healthcare providers can better tailor interventions and support strategies to help manage the condition.

The other options, while they may occur in individuals with ADHD, are not as central to the disorder's defining characteristics. Increased energy and sleep disturbances can be common in various contexts unrelated to ADHD, and chronic disorganization, although related to executive dysfunction, is primarily a result of attention difficulties rather than a standalone hallmark.