> (and yes there is a difference between ADHD and ADD). Not anymore. Under the new classifications, there is only ADHD. However, ADHD can come in three forms -

> (and yes there is a difference between ADHD and ADD). Not anymore. Under the new classifications, there is only ADHD. However, ADHD can come in three forms - "Predominantly Inattentive", "Predominantly Hyperactive", or "Combined".[0] So, confusingly, a person can have ADHD without any symptoms of hyperactivity, in which case they are diagnosed with "Attention Deficit Hyperactivity Disorder - Primarily Inattentive". The differential diagnosis between the three types is time-consuming and oftentimes not worth the trouble or expense except in more severe cases, so it's common for doctors either to subjectively apply the one they feel fits the individual without comprehensive testing, or to default to "Combined". [0] It's actually slightly more complicated than that, depending on whether you use ICD-9, ICD-10 or the DSM V, but ICD-10 and the DSM V both agree that ADHD is the canonical term, and ADD is "deprecated" (to appropriate the software terminology).