"initial insertion was painful but after a few days it got better with the cramping. however after that i had cramping everyday and had to take ibuprofen and the last couple of weeks i had very painful cramps. went today for my follow up appointment (a month after insertion) to check placement. the sonographer found that i had a ruptured cyst on one of my ovaries she explained that could have been the reason for the recent painful cramps. looking up adverse reactions on the bayer&#039;s website says that cysts are an adverse reaction. so beware that can happen when you get kyleena. my doctor said that the iud doesn&#039;t cause cysts but right on their website it&#039;s listed as an adverse reaction. i don&#039;t know what to make of the iud  if seems like a lot risks."