Children with ADHD show inattention, distractibility, hyperactivity, and impulsivity more frequently and severely than children of the same age or developmental level. ADHD occurs in 3-5% of school age children and can run in families.  A child with ADHD may also have other psychiatric disorders such as conduct disorder, anxiety, depression, bipolar disorder or learning disabilities.

Without proper treatment, the child will have difficulty paying attention in class, not complete schoolwork, and thus attain low grades.  The symptoms of ADHD in childhood can continue into adulthood, especially if left untreated, and can cause significant problems in holding steady jobs and maintaining healthy relationships.