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Attention Deficit Hyperactivity Disorder (ADHD)
Topic Overview What is attention deficit hyperactivity disorder (ADHD)? Attention deficit hyperactivity disorder (ADHD) is a condition in which a person has trouble paying attention and focusing on tasks, tends to act without thinking, and has trouble sitting still. It may begin in early childhood and can continue into adulthood. Without treatment, ADHD can cause problems at home, school, work, and with relationships. In the past, ADHD was called attention deficit disorder (ADD).