Some reasons for concern about attention deficit hyperactivity disorder.
Attention deficit hyperactivity disorder (ADHD) is not a disease. The symptoms of its three dimensions (activity, attention and impulsivity) are normally distributed in the population, with an arbitrary level of symptoms being designated pathological. The presence of the ADHD cluster is never grounds for any positive diagnosis; it is an indication for further assessment. Positive response to stimulants is not specific to the ADHD population, and is no way diagnostic.