What is the primary function of birth control pills?

The primary function of birth control pills is to release hormones that work to stop ovulation. This means that when a person is taking these pills, they prevent the ovaries from releasing an egg each month, which is a crucial aspect of how they effectively prevent pregnancy. By inhibiting ovulation, birth control pills reduce the chances of sperm meeting an egg.

While some birth control methods can regulate menstrual cycles and may also have effects on menstrual symptoms, the main mechanism by which birth control pills prevent pregnancy is through the suppression of ovulation itself. Additionally, birth control pills do not provide protection against sexually transmitted infections, which is an important distinction when considering sexual health. Therefore, the action of stopping ovulation is central to their function as a contraceptive method.