What are the symptoms to ADHD?
Inability to maintain attention, being hyperactive and impulsivity are the three key elements to ADHD.
Generally there are two sub-types to this disorder: predominantly inattentive type, predominantly hyperactive-impulsive type, or sometimes a combination of both .
Predominantly Inattentive Type
Predominantly Hyperactive-Impulsive Type
 Ramsay, J. Russell. Cognitive Behavioral Therapy for Adult ADHD. Routledge, 2007. ISBN 0-415-95501-7