At the awards ceremony at the 2018 Wildflower Triathlon, professional triathlete Kelly O'Mara wondered if she should quit her birth control pill. She was sitting with several other athletes and they ...

Hormonal birth control helps prevent pregnancy by stopping ovulation and blocking sperm. Nonhormonal methods work by physically blocking sperm or using spermicide. Hormonal options include pills, ...

One aspect of hormonal contraceptives' effect on the teenage body remains a mystery -- whether and how they modify the developing brain. New research in young rats links synthetic hormones found in ...

New research suggests certain types of hormonal contraceptives are linked to a higher risk of heart attack and stroke. Estrogen-containing contraceptives — especially the vaginal ring and skin patch — ...

Researchers at the University of Oulu have identified a previously unknown mechanism in humans that may explain why certain medicines and environmental chemicals disrupt the balance of sex hormones.