Stress & Wellness Consulting • Occupational & Clinical Psychology
                    Attention deficit hyperactivity disorder (ADHD, similar to hyperkinetic
                    disorder in the ICD-10) is a neurodevelopmental psychiatric disorder in
                    which there are significant problems with executive functions (e.g.,
                    attentional control and inhibitory control) that cause attention
                    deficits, hyperactivity, or impulsiveness which is not appropriate for a
                    person’s age. These symptoms must begin by age six to twelve and
                    persist for more than six months for a diagnosis to be made. In
                    school-aged individuals inattention symptoms often result in poor school
                    performance. Although it causes impairment, particularly in modern
                    society, many children with ADHD have a good attention span for tasks
                    they find interesting.
                    
                    Despite being the most commonly studied and diagnosed psychiatric
                    disorder in children and adolescents, the cause in the majority of cases
                    is unknown. It affects about 6–7% of children when diagnosed via the
                    DSM-IV criteria and 1–2% when diagnosed via the ICD-10 criteria. Rates
                    are similar between countries and depend mostly on how it is diagnosed.
                    ADHD is diagnosed approximately three times more in boys than in girls.
                    About 30–50% of people diagnosed in childhood continue to have symptoms
                    into adulthood and between 2–5% of adults have the condition. The
                    condition can be difficult to tell apart from other disorders as well as
                    that of high normal activity.
                    
                    ADHD management usually involves some combination of counseling,
                    lifestyle changes, and medications. Medications are only recommended as a
                    first-line treatment in children who have severe symptoms and may be
                    considered for those with moderate symptoms who either refuse or fail to
                    improve with counseling. Stimulant therapy is not recommended in
                    preschool-aged children. Treatment with stimulants is effective for up
                    to 14 months; however, its long term effectiveness is unclear.
                    Adolescents and adults tend to develop coping skills which make up for
                    some or all of their impairments.
                    
                    ADHD, its diagnosis, and its treatment have been considered
                    controversial since the 1970s. The controversies have involved
                    clinicians, teachers, policymakers, parents, and the media. Topics
                    include ADHD’s causes and the use of stimulant medications in its
                    treatment. Most healthcare providers accept ADHD as a genuine disorder,
                    and the debate in the scientific community mainly centers on how it is
                    diagnosed and treated.
Source: https://en.wikipedia.org/wiki/Attention_deficit_hyperactivity_disorder