What type of device is an intrauterine device (IUD) used for?

An intrauterine device (IUD) is primarily used to provide a long-term method of birth control. This small, T-shaped device is inserted into the uterus to prevent pregnancy by either releasing hormones that inhibit ovulation and thicken cervical mucus or by creating a hostile environment for sperm, thereby preventing fertilization. IUDs can be effective for several years, depending on the type, making them a highly reliable form of contraception.

While IUDs do not offer protection against sexually transmitted infections, nor are they primarily designed to regulate menstrual cycles or assist in hormone therapy, some hormonal IUDs can have secondary benefits, such as reducing menstrual bleeding. However, their foremost function remains as a method of birth control, which distinguishes them from other types of devices and interventions.