In addition, very few women were diagnosed with breast cancer shortly after they had Mirena inserted. They all attributed to the low dose of
levonorgestrel contained in Mirena since breast cancer is a hormone-sensitive cancer. However, Mirena's hormone is very low dose and only supposed to affect locally within your uterus. It should not be circulated in your blood, unlike the pills etc. If not in blood, how can Mirena affect your body systematically can cause weight gain, or breast cancer?