Intrauterine devices can cause irregular vaginal bleeding, bleeding and long time, women in the removal of the IUD after the first time to menstruation is normal. Because when a woman has a birth control ring in the uterine cavity, it will stimulate the uterine lining to affect uterine contraction, so that the uterine lining is stripped and bleeding increases, after the removal of the IUD the stimulating effect of affecting the uterine contraction disappears, then it will lead to a low amount of menstrual flow, menstruation as long as the amount of menstrual flow is within the range of 20-60 ml are considered normal. The decrease in menstrual flow is related to the removal of the IUD, and is mainly related to the thinness of the uterine lining in the woman’s body, or the stimulation of cold, or mental stress that leads to low menstrual flow. When a woman’s menstrual flow is very small after the removal of IUD, and the volume is less than 20ml, it is best to go to the hospital to do gynecological ultrasound and sex hormone six examination, in order to take corresponding symptomatic treatment.