The onset of menstruation on the fourth day after IUD removal is considered to be related to the stimulation of the uterine lining and damage to the cervical tissues by the removal of the IUD, or it may be related to secondary infection. When removing the IUD, due to the operation may stimulate the endometrium or cervical tissues, some patients will have early menstruation, at this time do not need to be too nervous, it is considered to be a normal phenomenon, but women should pay attention to menstrual hygiene, pay attention to rest, pay attention to warmth, do not eat cold food. If accompanied by abdominal pain and fever, it is considered to be related to secondary uterine infection. For women who want to remove the IUD, it is important to note that the IUD should be removed when the menstrual period is clean for about 3~7 days, so as to reduce the bleeding, and it is also important to note that after the removal of the IUD, it is necessary to prohibit sexual intercourse for 2 weeks, and do not take a hot spring bath or a tub bath for 2 weeks to avoid causing local infection. For patients who have their period on the fourth day after the removal of the IUD, if the vaginal bleeding does not stop, it is recommended that they go to the gynecology department of a regular hospital, complete the ultrasound and other relevant examinations, and then take active treatment under the guidance of the doctor after clarifying the cause of the disease.