Attention Deficit Hyperactivity Disorder (ADHD) begins in childhood and generally persists through adulthood. The disorder occurs in 5% of children and 2.5% of adults and impacts functioning across multiple situations. ADHD is a persistent pattern of inattentive and/or hyperactivity-impulsivity that interferes with an individual's functioning or development.
Inattention is demonstrated as wandering off task, lacking persistence, difficulty maintaining focus and/or effort on tasks or activities, and disorganization.
Some behaviors associated with attention difficulties include: not attending to details; not sustaining attention in tasks or play activities; does not appear to listen when spoken to directly; fails to follow through on instructions and fails to finish schoolwork, chores, or workplace duties; has difficulty organizing tasks and activities; avoids or procrastinates engaging in activities that require sustained mental effort; often misplaces or loses items necessary to complete tasks; easily distracted by extraneous details; and forgetful in daily activities.
Hyperactive behaviors are characterized by excessive motor activity (when not appropriate) or excessive fidgeting, tapping, or talkativeness. Impulsiveness describes an individual that engages in hasty actions without thought to their potential consequences to self or others. Some behaviors associated with hyperactivity and impulsiveness include: often fidgets with or taps hands or feet or squirms in seat; often leaves seat in situations when remaining seated is expected; often runs around or climbs in situations where doing so is not expected or appropriate; often unable to play or engage in activities, even leisure, quietly; often "on the go", acting as if "driven by a motor", often talks excessively; often blurts out answers before the question has been completed; often has difficulty waiting to turn take; and often intrudes or interrupts others conversations or activities.
Source: Diagnostic and Statistical Manual for Mental and Emotional Disorders-V