Or they're illnesses and conditions primarily affecting women.
Chronic fatigue has only since covid (when men started reporting constant excessive tiredness) been started to be treated like a real thing by doctors. And it's still barely considered by most doctors.
Endometriosis is another 'chronic' womens condition that has only very recently started being researched properly and taken seriously. And again, it's still incredibly hard to get taken seriously and helped if you suffer from it.
See also the massive discrepancy between autism and adhd diagnosis in men and women, and with bpd diagnosis between women and men.
On a somewhat less severe side of things, lack of libido in women is still considered a jokey non-issue by most doctors but viagra has been on the market for decades for men.
There's a lot more but I'm too tired to keep writing this.