I appreciate your taking your own advice and researching to better educate yourself! It's always heartening to see that. No, unfortunately medical misogyny is a far larger issue than your comment, and I meant it more in the widespread sense of "here's someone who really should know this, as a professional regarding a common situation that could affect all their female patients / half the world's population, and yet they don't, very possibly through no fault of their own but because this very basic stuff about female anatomy isn't considered important enough to be taught." Medical misogyny is a pretty common catchphrase for a lot of these issues, whether it's failing to address how teaching male anatomy as the default does a disservice to women, to how much longer it can take women to get diagnosed correctly, etc.

FYI wrt relaxin, yes, sure, lower in the luteal phase than during pregnancy, but yes, still present sufficiently to increase joint issues! (As someone with hypermobility disorder I can validate this personally to boot!) IIRC oestrogen increases expression of relaxin, so they're not unrelated. You might enjoy this writeup: https://www.frontiersin.org/articles/10.3389/fendo.2022.827512/full .