https://www.reddit.com/r/ADHD/comments/1bin00r/comment/kvlsgcj/?utm_source=share&utm_medium=web2x&context=3 That is not true. ADHD occurs in people at every level of intelligence and achievement. If someone claims that, have them read: [https://pubmed.ncbi.nlm.nih.gov/27590827/](https://pubmed.ncbi.nlm.nih.gov/27590827/) The point of our review paper is that high achievers with ADHD are not achieving as well as they should given their native abilities. For example, I've done a few studies comparing high IQ people with ADHD and high IQ people with out ADHD. Those with ADHD are doing worse than those without ADHD in many areas of life even though they function better than the average IQ person.