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Attention deficit hyperactivity disorder can be characterized by impaired attention, hyperactivity or excessive motor activity, and impulsivity; which is disproportionate to age and the most common behavioral disorder in children and adolescents. Hyperactivity or excessive motor activity means an individual may seem to move about constantly, including in conditions when it is not appropriate, or excessively fidgets, taps or talks. Hyperactivity or excessive motor activity can be characterized by being unable to concentrate on tasks, being unable to sit still, excessive physical movement, excessive talking, interrupting conservations and acting without thinking. Attention deficit hyperactivity disorder is correlated with impairments of functioning in cognitive, academic, familial, and finally occupational domains of daily life. Impaired social functioning can be manifested as rejection by peers and conflicts with other children and adults. Highly familial disorder, environmental and other modifiable risk factors such as prenatal substance exposures, heavy metal and chemical exposures, nutritional factors, and lifestyle/ psychosocial factors are the commonly identified risk factors of attention deficit hyperactivity disorder.
