I had the IUD put in to help with the pain for Endomitriosis! My doctor (at the time) told me she wanted to try that as a last resort before a historectomy because getting rid of Endomitriosis with surgery the 2nd time around usually isn't as affective. I had asked her the side effects and made sure that weight gain was not one of them. She told me I "was not going to gain weight". 5 months later after having the IUD in, I am 13lbs bigger and my pain from my Endomitriosis is nonstop. This is not where I wanted to be, I have worked to hard in the past to get to the weight I was at by losing almost 100 pounds and now I'm going back up again. I'm looking for a new doctor and a better option ASAP!