A while back, I put out an announcement saying about the fact I may be realising I have undiagnosed ADHD...
It's no longer undiagnosed. Yep, I have ADHD, which honestly was not a surprise.
Now, why am I telling you this? I am open with people about stuff like this anyway for one. And for another, I guess to bring awareness in a way. If someone has a condition like ADHD, I want people to feel valid when talking about it, not dismissed. But also, if a person believes they may have it, to go get tested, because if they do have ADHD, getting tested opens up so many clearer paths. And even if you don't have it, the test and the people behind it can help you work out how your brain works and therefore also open those paths that may have been originally messy or blocked off.
And then of course there's the writing side of it (since most of us are writers here).
Being aware of ADHD, either having it yourself or knowing someone with it, you can create better, more realistic characters. Instead of saying a character has ADHD and writing them as always hyper, you can write about the different quirks a person with ADHD might have, like the fact I have 5 different keyboards, with all different clicky-clack sounds, so I can switch between which one is helping my brain focus a little better that day.