Generally speaking, the Maternity IUD can be used for 5 to 8 years, but the specific situation varies from person to person. The IUD is one of the many types of intrauterine devices, mainly in the shape of an umbrella, which contains a certain amount of active copper ions, mainly through mechanical barriers, changing the environment of the uterine cavity, changing the level of hormone secretion in the uterus to play the role of contraception, and in the uterus the slow release of copper ions will also affect the inflammatory state of the endometrium and the enzyme activity, so as to play the role of contraception. However, there are some side effects of the IUD. When the following situations occur, it is recommended to consult a doctor immediately to see if the IUD needs to be removed. 1. Abnormal menstrual flow: The IUD may affect the micro-environment of the uterus, and prolonged wearing of the IUD may lead to irregular menstruation, abnormal menstrual flow or dysmenorrhea; 2. Gynecological diseases: the IUD may cause some gynecological diseases, such as cervicitis, endometrial disease, etc. If there is any discomfort such as abnormal leucorrhoea or pain in the lower abdomen, it is recommended to consult a doctor immediately.