I think the idea is that men are stoic and uncomplaining so when they do speak up it must be very serious and proper action must be taken
Meanwhile women are supposed to be weak and unreliable, our bodies are always malfunctioning, and we are quick to complain. So it's probably not really serious.
This is held out in the amount of women who get turned away as having minor mental health issues when they are having heart attacks, tumours etc etc
My own story around this is being turned away from A&E when I had a broken bone in my hand. The man pulled it and yanked it (and it fucking hurt) and told me to go away as having xrays was expensive and just because I thought it was cool to have one didn't mean I was going to get one.
Still in pain 2 weeks later, went to GP, got xray, broken bone.
I suspect that my age as well as my sex went against me there.
What was annoying was that he pulled my hand as hard as he could looking at my face for distress. It really fucking hurt and I said ow and was flinching. This obviously wasn't enough to convince him that I was in pain...?
Oh and I had been in childrens hosp a lot as a kid, have had I'd guess well over 100 xrays by that point, his guess that I just wanted one to be cool was just WTF. Of course as a 16yo girl I didn't have the confidence to tell him that.