alt Hacker News> I'm not a scientist, but from personal experience every single person I've met with ADHD has had severe childhood trauma
I have an ADHD diagnosis. The only particularly traumatic thing in my childhood was my parents getting divorced when I was a teenager because my mother had an affair. I already had some symptoms of it before that happened. Prior to that, my parents might not have been the best parents you could possibly have, but they didn’t do anything that would merit the label “severe childhood trauma”
"Trauma" is a very bad name because it sounds violent and extreme, so you can easily think it doesn't apply to you. In actual fact, it can be caused by something as routine as "sleep training" where infants are left to cry themselves to sleep, or being snapped at for expressing emotion, all before the age of 5. The years before 5 are foundational, but you usually no not have memories earlier than 5 so it's very hard to say definitely what happened especially when causes for trauma are relatively routine.
You need a trusted therapist to guide you into exposing what the subconscious mind is holding onto from infancy. It is subtle, deep, difficult, rewarding work. But I do think people discount trauma because it sounds scarier than "someone snapped at me in frustration as an infant for expressing some emotion and I learned to disconnect from myself."