The principle of placing a contraceptive ring in the uterine cavity for contraception is that the endometrium is stimulated by a foreign body for a long time to produce a kind of aseptic inflammation, inflammatory cells increase, and there are substances in the uterine fluid that destroy the implantation of the fertilized egg. Pressure ischemia, plasminogen is activated, and the embryo sac is dissolved and absorbed, thereby achieving the purpose of contraception. While the contraceptive ring plays a role in contraception, it also causes the endometrium and vascular endothelium to be injured due to the mechanical compression of the contraceptive ring, releasing a large amount of anticoagulant substances, making the endometrium prone to bleeding, especially before and after menstruation. Therefore, some people have a longer menstrual period after the birth control ring is put on, and even some people have a small amount of bleeding during non-menstrual periods, and they show bloody leucorrhea or blood in the leucorrhea. When the bleeding is very small, it is light brown. Or dark brown vaginal discharge.

        Patients with bleeding or menorrhagia should be supplemented with iron, and certain hemostatic drugs should be selected according to the condition. If it still does not work, it may be a problem with the IUD itself, and you should consider replacing the IUD or using other birth control measures.