Are there other signs of ADHD besides the ones traditionally used to establish the diagnosis?

ADHD can show up in children in many ways besides those defined by established criteria in DSM-IV-TR. Social-skill issues may be the presenting symptoms at home and at school. Children may display isolated aggressive behavior in preschool and early elementary school, because of their impulsivity and poor attention to verbal and visual cues. Because their disruptive behavior often results in conflicts with peers, siblings, and authority figures, such children stand out from their classmates. Consequently, they tend to be rejected by their peers. Children with ADHD may also be quite messy and disorganized. Parents frequently describe bedrooms in complete disarray, backpacks with papers falling out, and poor eating habits. General academic difficulties are also common. Children forget their assignments, do not appear to be listening in class, and get poor grades. In addition, they may have what are usually called executive functioning problems: difficulties with planning, starting tasks, shifting from one activity to another, controlling responses, and staying interested and motivated.