However, changes from a normal bleeding cycle
are the main reason given by 10-30% of users for discontinuation, and as yet there has been little progress in finding a method to treat irregular bleeding.
Menstruation--the monthly bleeding cycle
of fertile women--is more than "the curse" or a "period.
The reason that implant users with regular bleeding cycles
are at greatest risk for pregnancy is that they have a greater frequency of ovulatory cycles than do women with irregular bleeding patterns," the researchers write their report.