This issue of NASET’s ADHD series was written by Cynthia Hammer. Often people form opinions that are not based on facts.  This article includes only facts, information based on research, which might challenge opinions you have about ADHD, its causes, manifestations, and treatments.  If you read something that differs from what you believe, I hope you will reconsider your beliefs. ADHD is a chronic neurodevelopmental condition that is largely genetic in nature.  Although each child’s brain is as unique as his fingerprints, children with ADHD have small variations in their brain chemistry and structure that differ from neuro typical children. Most children are born with ADHD and continue to have it throughout their lives. It does not result from poor parenting although environmental factors can lessen or exacerbate its symptoms.  The focus of this article will be to address 8 essential things to know about ADHD-Primarily Inattentive Type.