Hormonal IUDs, or intrauterine devices, are small, T-shaped contraceptive devices placed inside the uterus to prevent pregnancy. They release a hormone called levonorgestrel, which thickens cervical mucus, making it difficult for sperm to reach an egg. Hormonal IUDs can also thin the uterine lining, reducing the likelihood of implantation. These devices can provide long-term contraception, lasting between three to seven years, depending on the specific type. They are over 99% effective and can be removed at any time if a woman wishes to become pregnant. Hormonal IUDs are a popular choice for those seeking a reliable and low-maintenance birth control method.