An obstetrician/gynecologist, this title is commonly shortened to OB/GYN. Gynecologists specialize in diseases of the female reproductive organs, and obstetricians specialize in pregnancy and childbirth. Doctors often specialize in both so that they can help patients with a full range of reproductive medicine. Common reasons for visiting an OB/GYN are: you're seeking a contraceptive method, are experience irregular period symptoms or pelvic pain, or are seeking prenatal care. It's also recommended that patients with female reproductive organs have an exam by the OB/GYN once per year.