"i am on my second mirena - i had the first one for the full 5 years and loved it. i want to caution about one thing that has not been mentioned in any of the posts i have read.  after the first mirena my new doctor insisted on an ultrasound before replacing it with a new one for 5 more years. i am grateful she insisted. i had 2 strawberry sized cysts - one on each ovary.  easily treated with 3 months of birth control. the cysts disappeared and i was able to have a new mirena. this insertion was very painful. in the hour afterwards i broke into a sweat and almost passed out. it has been 2 days and i&#039;m much better, just light cramping.  please get an ultrasound before replacing.  my doctor will also require follow up ultrasounds in 2 years."