Adults with ADHD are frequently diagnosed by their health care physician, a psychiatrist, or a psychologist. A history of the adult's conduct as a child is required for the doctor to identify ADHD in adults. Adults with ADHD may not recognize themselves as having a problem until they are informed about it and given appropriate treatment. A primary care physician can diagnose attention-deficit/hyperactivity disorder (ADHD) in children by looking for certain signs and symptoms of this condition. Primary care physicians also work with other doctors to treat patients with ADHD or refer them for further evaluation and treatment by specialists. Attention deficit hyperactivity disorder is a brain disorder that affects the ability to pay attention, control impulsive behavior, and manage time effectively. It is more common in boys than in girls and often starts showing up in childhood. About 10% of children have ADHD; however, many experience some degree of improvement as they grow older. Those who have ADHD tend to have more problems focusing their attention on one thing for a long period of time. This may result in failing school grades, poor social skills, and trouble holding a job.