The main problem with the perspective given in your other post Jimmy is that it isn’t a matter of “knowing.” You use that word to try to paint these people as arrogant. It’s a matter of them physically experiencing stuff happening with their bodies, not “knowing” intellectually. After the stuff doesn’t go away for awhile, they would like to know why it’s happening, but that comes later.
The other type of thing I look at would be, for example, a post on another account on another forum, where a guy who had won member of the month had an un-diagnosed issue with his pelvis and lower abdomen not from PE or direct injury, and instead of trying to de-legitimize it, someone, it might have been you, but I’m a moron so I don’t know, started talking instead about how low grade inflammation might not show up on any tests.