I'm 35 yrs old. I've had the Mirena for about 2 yrs and have gained about 15 lbs during that time. Could not for the life of me put two and two together as to why I was having lower abdominal, leg and back pain, not to mention multiple ovarian cysts, calcium deposits in my uterus and mood swings. I too was told that the Mirena doesn't cause weight gain. Well, it certainly doesn't help with weight loss either! It is expected that we gain some weight as we age, I understand, but after dieting and exercising and no budging on that scale, it's pretty discouraging. Having it removed on the 23 rd and counting down the days. Need to be hormone free for a while, can't subject my body to go through this anymore.