I knew a doctor with Parkinson’s, and a good friend, now, who went through several t-shirts a day with massive musky sweating and apparently discolored the t shirts with their increased sweating.
Good doctors for centuries have relied on their olfactory senses, to go with their visual and auditory senses. They use all of their senses to make a diagnosis along with using their stethoscope and touch and feeling their patients.
So a non MD person with excellent olfactory sense might be able to sense this terrible disease and others.
Read a month or so ago that teaching hospitals are going back to that type of diagnosis. Checking online with symptoms just isn’t good for the bottom line, I guess.