They don't, physicians are close to gender parity. What you see is that Physicians used to skew male a long time ago, but that isn't the case any more in younger generations.

And Physicians isn't about people, Physicians is about seeing people as things you can fix, so it tickles both the "people" and the "thing" aspects at the same time, which would explain why gender ratio is about equal.

If you remove the "things" aspect from physicians you are left with nurse, which skews extremely female.