Important Notice: Our web hosting provider recently started charging us for additional visits, which was unexpected. In response, we're seeking donations. Depending on the situation, we may explore different monetization options for our Community and Expert Contributors. It's crucial to provide more returns for their expertise and offer more Expert Validated Answers or AI Validated Answers. Learn more about our hosting issue here.
IUDs work mainly by preventing fertilization. The copper-bearing IUDs interfere with fertilization and make the uterus a “spermicidal environment.” The sperm are killed or impaired and cannot reach the egg. IUDs that contain progestin cause thickening of the cervical mucus, which stops sperm from entering the uterus.
