My thanks to rvallee for pointing out that "brain fog" has no medical name and therefore no proper, medical recognition. I seem to have internalized the fact so deeply that the obvious had escaped me. The "fog" has been, for me, as bad as the lead overalls. If I could just stay in but still function well mentally, it would be a whole different world. One example that comes to the befuddled brain is from a few years ago after the auto-checkouts came in, at the supermarket. I had a common item, a fruit or vegetable, but I couldn't for the life of me remember the name of it, so bad was the fog; so I couldn't select it in the auto-checkout menu. I stood there for several minutes, feeling more like a fool than usual and trying to look busy until it finally came to me. It's such moments that make one realize that the walls around one's life have just closed in that little bit more. Yet it is still not something that is generally recognized as a thing and it really should be. While I understand that starting up another name war might well be counter-productive, having a good, precise name for it seems essential. And, while the plain English of "brain fog" has long seemed to me to be perfectly apt, apparently it lacks the respect of medical profession. Neither word has a classical root and, obviously, to be accepted it must have a Latin or Greek root. And such terms as "cognitive dysfunction" are also too broad and imprecise. I've had a little look around and there is a good Latin word that could be applied: "caligo". It means darkness, fog, mist, vapour, gloom and even specifically "mental fogginess". The problem with it is that it has already been used as a medical term, albeit one that is now obselete, meaning: "dimness or obscurity of sight, caused by a speck on the cornea". It would probably be disqualified on that basis so I'm wondering if there is another term. Obviously the idea is to find one that makes medical professionals feel clever by knowing it and being able to define and apply it; and it should be ready and available to hang the appropriate, specific definitions onto as and when they are discovered. Perhaps one could go Greek with "Idiopathic Omíchli" (another "fog" word). I've also thought that "Idiopathic Idiocy" might appeal to some sections of the medical profession (both words also have Greek roots) but maybe I should shut up now. Any ideas?