I saw this posted on a website about side effects
The Mirena IUD can cause ovarian cysts
. Some women using the Mirena stop bleeding altogether. Usually their menstrual periods return when the IUD is removed. Mirena can cause weight gain, headaches, increased blood pressure, acne, depression, and decrease in sex drive.
Also, I have repeatedly seen information that states if you have a strange fluid or odor coming from you vagina, you should get in touch with your health care provider.