The generic name of the Mannix ring is levonorgestrel intrauterine sterilization system, uterine adenomyosis on levonorgestrel intrauterine sterilization system may come to menstruation, may cause amenorrhea. Because the levonorgestrel intrauterine birth control system contains the progestin levonorgestrel, placed into the uterine cavity, the drug in the endometrium of the local role of the endometrium leads to thinning of the endometrium, some patients will appear to have a small amount of menstruation, a part of the will be manifested as amenorrhea. Levonorgestrel intrauterine system in addition to the contraceptive effect, for menstruation and other cases there is a certain therapeutic effect, placed in the uterine cavity later or not come to menstruation is a normal reaction; if you have sex also need to be delayed after menstruation pregnancy test, although contraceptive effect, but is not a hundred percent contraceptive success rate. If you feel unwell, you should go to the gynecology department of the hospital in time, and improve the examination under the guidance of the physician to make a clear diagnosis.