Study of Finnish women using progesterone - releasing IUD found higher risk of breast cancer . Because it strengthens the uterine lining , it helps cut down on heavy bleeding . The women were using the IUD to help with their heavy periods . The earlier study did not show such a risk .
Study of Finnish women using progesterone - releasing IUD found higher risk of breast cancer . The women were using the IUD to help with their heavy periods . The earlier study did not show such a risk .