Obstetricians and gynecologists are getting burned out and retiring earlier, and fewer prospective medical students are choosing women's health as their speciality, according to an analysis by Doximity, a social networking site for doctors and other health care professionals. That could lead to a severe shortage of OB-GYNs, especially in parts of the country that have above-average birth rates.

Why it matters: OB-GYNs are crucial primary-care physicians for women. If their numbers continue to dwindle, women will be at a disadvantage to get vital health care services. The high rate of pregnancy-related deaths for mothers won't get any better, either.