ADD - AD/HD

ADD, Attention Deficit Disorder, is the original classification created to identify difficulties with attention and focus caused by a neurological chemical imbalance. Later, the classification of AD/HD, Attention Deficit Hyperactivity Disorder, was created to identify difficulties with attention and hyperactivity. Today, ADD is considered a subtype of AD/HD, denoted as AD/HD-Inattentive Type, whereas hyperactivity is denoted as AD/HD-Hyperactive Type. A combination of these to conditions is denoted as AD/HD-Mixed. This type of sub-classifications are similar in purpose and nature to the sub-classifications associated with Dyslexia.