Contraception

What is the difference between a copper IUD and a hormonal IUD?

The Copper IUD does not include any hormones and works by using the properties of copper to affect sperm motility and egg survival. This lowers the chance of successful implantation of a fertilised egg. In comparison, the Hormonal IUD, contains a small amount of progestogen that is released directly into the reproductive system. Usually, only trace amounts of hormones make it into the bloodstream. These hormones cause the mucus of the cervix to thicken, which prevents the sperm from entering the uterus to fertilise the egg. It also thins the uterine lining to reduce the chances of successful implantation of a fertilised egg, and reduces the chances of ovulation. Since it reduces the amount of blood flow it is also a good treatment for heavy menstrual bleeding. By contrast the copper IUD can cause heavier blood loss during menstruation.