The Mirena intrauterine device (IUD) is a hormonal contraceptive that releases a low dose of progestin. While the Mirena IUD does not directly cause yeast infections, it can potentially affect the vaginal environment and increase the risk of developing one.
The hormonal changes caused by the Mirena can alter the pH balance in the vagina, making it more conducive to the growth of yeast, such as Candida albicans, which is responsible for most yeast infections. The progestin hormone can also affect the vaginal flora, disrupting the natural balance of bacteria that helps keep yeast in check.
It's important to note that not all women who use the Mirena IUD will experience yeast infections. Each person's body reacts differently to hormonal changes, and while some individuals may be more prone to yeast infections with the Mirena, others may not experience any change.