The IUS does not cause heavy bleeding. In fact, one of the benefits of the IUS is that it decreases menstrual bleeding and as such it has been registered by the Medicine's Control Council not only as a contraceptive but also as a treatment for heavy menstrual bleeding.
During the first three months after insertion of an IUS, women may experience an increased number of bleeding and spotting days. However, after that time the menstrual period will be significantly reduced or stop all together. In as many as 45% of cases, the menstrual period will disappear altogether.