Attention deficit hyperactivity disorder (ADHD or AD/HD or ADD) is characterized by the co-existence of attention problems and hyperactivity, with each behavior occurring infrequently alone. ADHD is the most commonly studied and diagnosed psychiatric disorder in children, affecting about 3% to 5% of children globally. While symptoms usually start before seven years of age, many are not diagnosed until later in life and 30% to 50% of those diagnosed in childhood continue to have symptoms into adulthood. Adolescents and adults with ADHD tend to develop coping mechanisms to compensate for some or all of their impairments. When this disorder is not treated or diagnosed, it can cause the person to self medicate with drugs and alcohol.
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