Hello Bianca, This is Dr. Papaqako answering your question. Mirena IUD is a hormone-releasing system placed in your uterus to prevent pregnancy for up to 5 years and should be inserted by a trained healthcare provider. The most common side effects of Mirena are amenorrhea, intermenstrual bleeding and spotting, abdominal/pelvic pain, ovarian cysts, headache/migraine, acne, and depressed/altered mood. Some women chose to keep it anyway despite these side effects. But, you should get emergency medical help if you have severe pain in your lower stomach or side. This could be a sign of a tubal pregnancy (a pregnancy that implants in the fallopian tube instead of the uterus). A tubal pregnancy is a medical emergency. Also, The levonorgestrel intrauterine device may become embedded into the wall of the uterus, or may perforate (form a hole) in the uterus. If this occurs, the device may no longer prevent pregnancy, or it may move outside the uterus and cause scarring, infection, or damage to other organs. If the device embeds in or perforates the uterine wall, your doctor may need to surgically remove the device. Call your doctor at once if you have a serious side effect such as, severe cramps or pelvic pain; extreme dizziness, feeling like you might pass out; heavy or ongoing vaginal bleeding, vaginal sores, vaginal discharge that is watery, foul-smelling discharge, or otherwise unusual; severe pain in your side or lower stomach; pale skin, weakness, easy bruising or bleeding; fever, chills, or other signs of infection; pain during sexual intercourse; ect... Hope this helps, Take care.