Is ADHD a mental illness? ADHD is one of the most researched and prevalent childhood brain disorders. ... ADHD, or attention deficit hyperactivity disorder, is classified as a psychiatric disorder and the symptoms often continue through adolescence into adulthood. VIEW PERVIOUS POST: https://mountain-vista-psychology-pllc.business.site/posts/4573441076068685479 VIEW DIRECTIONS FROM Meridian, Colorado: https://goo.gl/maps/VCP26jj6B28KSoQW7 Mountain Vista Psychology, PLLC 88 Inverness Cir E Building E – Suite 103 Englewood, CO 80112 (720) 583-9332