There are four reasons for vaginal bleeding with the Manned Ring: 1. Manned Ring is not an ordinary ring, it contains a certain amount of progesterone, which will be released slowly and stimulate the endometrium to appear a small amount of bleeding. 2. After the ring is placed in the uterine cavity, it will stimulate the surrounding tissues to appear damage, mucosal congestion and edema. In case of strenuous activity or abnormal stimulation, contraction of the uterus will occur and spot bleeding will occur.3. After the IUD is placed, the position changes with menstruation and contraction of the uterus, such as dislodgement and ectopic position, which requires regular review at the hospital.4. Endometritis occurs after the IUD is placed, and inflammation leads to local edema and brittleness, irregular bleeding and abnormal secretions. The sensitivity of each patient is different, and the amount and time of bleeding varies. It is best to go to the hospital for timely examination and treatment under the guidance of a doctor when bleeding occurs after IUD, and do not have sex during bleeding and inflammation.