hi thanks for your query Mirena coil contains levonorgestrel . this has some side effects 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,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,sudden numbness or weakness, especially on one side of the body,breast tenderness or pain,weight gain, acne, changes in hair growth,and mood changes. It may become embedded into the wall of the uterus, or may perforate 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. In above condition you must consult your doctor I hope this will help Best wishes