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A disorder arising in childhood or adolescence which is marked by an inability to learn or other functional deficits that cannot be explained by intellectual, sensory or health factors; an inability to build or maintain satisfactory interpersonal relationships with peers, teachers and other adults; inappropriate types of behavior or feelings under normal circumstances; a general pervasive mood of unhappiness or depression; and a tendency to develop physical fears associated with school problems or other issues that is severe enough to adversely affect the child's educational performance or ability to engage in age-appropriate activities. Characteristics may include hyperactivity, aggression or self-injurious behavior, withdrawal, immaturity, and learning difficulties.