> To my knowledge, you cannot scan the brain of someone with ADHD and point out an abnormality associated with the disorder. Yet we give 8 year old boys stimulant medication because they can't sit still in a classroom for hours a day.

I'm not well-versed in the risks of stimulants given to children so I'm not commenting on that specifically, but I want to push back on the insinuation (if I understood you correctly) that ADHD or its treatments are any less legitimate because we haven't yet figured out if we can use brain imaging to diagnose and measure treatment efficacy.

It would be great if all medical disorders could be externally measured and quantified objectively, but when they're not, we often rely on evaluating and diagnosing them based on the (often somewhat more subjective) impact of their symptoms. That's not ideal, but it seems better than nothing to me.

Full disclosure: I'm also diagnosed with ADHD and take daily stimulants. Apologies if I came off as combative, I'm relatively new to my ADHD journey and genuinely curious to learn more about the medical/scientific aspects.