IUCD - Side effects
The copper IUCD usually does not cause any significant changes to a woman's body except that the menstrual flow can become heavy in a small group of women. There may be some cyclic cramps in the lower abdomen especially at the time of the menstrual flow.
Since the Mirena system has a hormone on the coil, there may be some effects on the menstrual flow. A majority of women will usually experience unscheduled vaginal bleeding that is scant, especially in the first three to six months after insertion. After this period, many women will have their periods disappear. This should not be a source of anxiety since it does not mean you are pregnant. A few women on Mirena may experience breast discomfort and occasional headaches, but this is quite unlikely to occur.
Attribution: Avallain