abnormal uterine bleeding
"For anyone considering getting the Mirena PLEASE read reviews & weigh out other options. My doctor suggested I try the Mirena as treatment for PCOS. This was by far the worst decision I have EVER made. Almost every side effect stated possible, I had. Hair loss (that still, 2  years later hasn't returned to it's thickness), pain in the pelvic area, back pain, leg pain, weight gain (25  pounds in the central area), mood swings, depression, fatigue and more. This shouldn't even be an option anymore. I highly advise you to choose another method."