Uncertainty does not imply psychological. It’s like saying ”our users report a lot of different bugs that we can’t reproduce, they must be all imagined”, except the body is OOMs more complex than even the most carelessly developed enterprise application. There is uncertainty in every part of medicine, all the time. That’s why it takes time and is difficult (often too difficult) to root cause everything that happens.
If you have a novel pathogen with neurological effects (see olfactory impacts - people literally losing their sense of smell), it would be my first guess of mysterious symptoms rather than.. checks notes the war in Ukraine? Honestly I’m not sure how to connect your first sentence to the next.