That's shifting rapidly. Women are very close to 50% of medical school graduates as of 2015. [1]
[1] https://www.kff.org/other/state-indicator/medical-school-gra...
[1] https://www.kff.org/other/state-indicator/medical-school-gra...
Nursing is one of the best all-around careers in the US when you take all factors into account (barriers to entry, pay, potential advancement, availability of jobs in both urban and rural areas, lack of ageism, long-term stability, etc.). Certain specialist nurses like CRNAs can make $150k+. Nurse practitioners also have a higher median salary than software developers in the US according to the BLS.