What is Attention Deficit Disorder? Commonly referred to as ADD, Attention Deficit Disorder is not easily defined. ADD is a condition affecting the brain that makes it difficult for some people to control their behavior. ADD has been medically defined as a neurological disorder. There are many symptoms, and not all people with attention deficit disorder share every symptom. The first signs of ADD often, but not always, show up in early childhood. ADD may also be accompanied by a learning disability. ADD also affects behavior in specific, yet very different ways. Some people with ADD tend t…