ADHD: Diagnosis, Treatment, Etiology and Treatment Perspectives Attention Deficit with Hyperactivity Disorder commonly known as ADHD is classified as a disruptive behavior disorder usually diagnosed during 'childhood. ADHD is the most commonly diagnosed childhood behavioral disorder. It appears to be more common in boys than in girls. This disorder is more common in boys than in girls and approximately five in one hundred children are affected (Busing). There are three subtypes: predominantly hyperactive-impulsive, predominantly inattentive, combined hyperactive-impulsive, and inattentive (most children have the combined type of ADHD) (nimh.nih.gov). The age of onset of ADHD is usually between preschool and early elementary school. school years. According to the Diagnostic and Statistical Manual, “the essential feature of Attention-Deficit/Hyperactivity Disorder is a pattern of inattention and/or hyperactivity-impulsivity that is more severe than typically observed in individuals of a comparable developmental level” (DSMIVtm, p .78). The second essential feature is that the symptoms began before the child was seven years old. (DSMIVtm). When the child starts school or enters primary school, when he should be able to concentrate, sit still and listen, his symptoms become more noticeable, and that is usually when he is diagnosed (general surgeon). Another essential feature for diagnosis is that the impairment must occur in at least two contexts. (nimh.nih.gov). Adults can have ADHD, although, if they do, it existed undiagnosed when they were children. (nimh.nih.gov) Adults may unknowingly have ADHD. These are adults who may lack organizational skills, be unable to hold a job, and forget appointments. Daily life for an undiagnosed diagnosis... at the center of the article ......on deficit disorder (ADHD) | Psych Central." Psych Central - Trustworthy information on mental health, depression, bipolar disorder, ADHD, and psychology. 2007. Web. May 28, 2010. "Mental Health: A Report of the Surgeon General - Chapter 3." Office of the Surgeon General (OSG ).Web. May 25, 2010. .Myers, Dr Bob. "ADHD Information: Kids: Information Tips for Parents." June 3, 2010. .Stubbs, R. "ADHD - Ty Pennington Speaks." 03 June 2010. .