ADHD:
ADHD or ADD is characterized by a majority of the following symptoms being present in either category (inattention or hyperactivity). These symptoms need to manifest themselves in a manner and degree which is inconsistent with the child's current developmental level. That is, the child's behavior is significantly more inattentive or hyperactive than that of his or her peers of a similar age.
Symptoms of Inattention:
often fails to give close attention to details or makes careless mistakes in schoolwork, work, or other activities
often has difficulty sustaining attention in tasks or play activities
often does not seem to listen when spoken to directly
often does not follow through on instructions and fails to finish schoolwork, chores, or duties in the workplace (not
due to oppositional behavior or failure to understand instructions)
often has difficulty organizing tasks and activities
often avoids, dislikes, or is reluctant to engage in tasks that require sustained mental effort (such as schoolwork or
homework)
often loses things necessary for tasks or activities (e.g., toys, school assignments, pencils, books, or tools)
is often easily distracted by extraneous stimuli
is often forgetful in daily activities
Symptoms of Hyperactivity:
often fidgets with hands or feet or squirms in seat
often leaves seat in classroom or in other situations in which remaining seated is expected
often runs about or climbs excessively in situations in which it is inappropriate (in adolescents or adults, may be
limited to subjective feelings of restlessness)
often has difficulty playing or engaging in leisure activities quietly
is often "on the go" or often acts as if "driven by a motor"
often talks excessively
Symptoms of Impulsivity:
often blurts out answers before questions have been completed
often has difficulty awaiting turn
often interrupts or intrudes on others (e.g., butts into conversations or games)
resource:
http://www.adhd.com