The reasons for the old unclean menstruation after using Mannix IUD: firstly, menstrual disorders caused by local discomfort after using Mannix IUD; secondly, local discomfort after using Mannix IUD, which leads to the formation of inflammation due to local irritation. At present, it needs to be combined with gynecological examination and clarification of past medical history to make a final and definite diagnosis. If there is any discomfort after applying the IUD, you can go to the Obstetrics and Gynecology Department of regular hospitals or community health centers within 3-7 days after menstruation for further examination, and follow the doctor’s instructions after making a clear diagnosis, and then you can remove the IUD if necessary. Theoretically, Man Yue Le IUD can reduce the volume of menstrual blood, shorten the bleeding time of menstruation, and relieve menstrual cramps, but it cannot be ruled out that some patients are not adapted to it.