Attention-Deficit Hyperactivity Disorder ADHD formerly known as ADD, is a neurobiological condition that consists of symptoms of inattention and/or hyperactivity that are significant enough to interfere with an individual’s functioning. While symptoms of this condition are evident in childhood, many adults today have not received proper assessment and treatment. A recent study found that 4.4% of adults in the US meet the criteria for a diagnosis of ADHD yet fewer than 11% of these adults receive treatment.