abnormal uterine bleeding
"Had Mirena inserted due to heavy bleeding and cramping. Did wonders right away. My periods were very light while on it. However I began having back and leg pain almost immediately, and after 3 1/2 months had a major attack of sciatica, to the point that o could hardly walk. This occurred 4 weeks ago and I'm still having pain and numbness in my back, leg and foot. Had iud removed as I've read that this can be a side effect."