(ADD)

Definition

Children with ADHD-the most common of the psychiatric disorders that appear in childhood-can't stay focused on a task, act without thinking, can't sit still, and rarely finish anything. If untreated, the disorder can have long-term effects on a child's ability to make friends or do well at school or work. Over time, children with ADHD may develop depression, lack of self-esteem, and other emotional problems.