Are ADHD and OCD under some type of mental illness? Related to question.

Mania, hypomania, depression and bipolar are mood disorders, from what I understand.

Are ADHD and OCD under some category as well? From what I understand, the are opposite ends of some impulsive-compulsive spectrum?

OCD is an anxiety disorder (same link as earlier), from what I understand, but what about ADHD? Is there another description of OCD that also applies to ADHD?
ADHD is considered a neurodevelopmental disorder.


  Neurodevelopmental disorders are impairments of the growth and development of the brain or central nervous system. A narrower use of the term refers to a disorder of brain function that affects emotion, learning ability, self-control and memory and that unfolds as the individual grows.


You are correct in that OCD is generally considered an anxiety disorder. They are not the same because ADHD is characterized by cognitive impairment, and OCD is characterized by anxiety (in the form of obsessions and compulsions). However, you can find both disorders in one person.