Neurodivergence is something you have to have evidence of since childhood to get diagnosis - otherwise you get a diagnosis of CPSD, EUBPD etc. So no, ADHD and ASD aren’t manifestations of psychological trauma over your lifetime.
Autism and ADHD are genetic, and have some link to birth trauma like premature birth and steroid use (to mature the underdeveloped lungs). In my case it was both. Boomer parents obv undiagnosed like everyone of their generation but dad is a stamp-collecting, narrow interests, social recluse (prefers just a few people he knows, hates gatherings) and my mum is a Duracel bunny with no filter. Always on the move.
So obvious where my AuDHD is from - diagnosed at 48 after perimenopause and dropping hormones caused burnout, ramped up ADHD symptoms and made coping impossible. Suddenly the little focus I was previously able to keep on leash was gone. The sensory issues got worse (misophonia) etc. I wouldn’t have considered diagnosis (not on my radar at all) until a colleague spoke to me at work… and the ball got rolling.
First a chat with GP and preliminary screener. Referral to the NHS CMHP and more forms.. once hubby ‘filed’ away and I then retuned late, in true ADHD fashion. Lots of questions/forms. Was really interesting to see how my OH rated my behaviours compared to how well I thought I did. Then waited, and waited. Our NHS waitlist is prob about 4yrs now so I went private in the end. Major impostor syndrome. Thought I was making it up, nobody would diagnose me, and instead of just ADHD I was told I have that and most likely ASD too.