It is recommended that women should go to the hospital in time for pelvic ultrasound, routine blood tests, electronic colposcopy and other examinations to clarify the cause and treat the cause: 1. Mechanical stimulation: the IUD stimulates the endometrium in the uterine cavity and may cause irregular shedding of the endometrium, which is manifested as vaginal Irregular bleeding, heavy menstrual flow or incomplete menstruation. It may also irritate the uterus and cause irregular contractions, resulting in menstrual pain or lower abdominal discomfort. After IUD placement, this condition should gradually decrease within 3-6 months until it disappears. 2. Aseptic endometrial inflammation: compression of the endometrium by the IUD can cause the endometrium to secrete a large amount of prostaglandins, which can affect the coagulation environment in the uterine cavity and cause dripping menstruation. It can be treated with oral treatment under doctor’s guidance. 3. IUD displacement: Irregular vaginal bleeding, abdominal pain, back pain and other symptoms can occur, and in serious cases, uterine perforation may even occur. In this case, hysteroscopic surgery is needed to remove the IUD. Because once the IUD is displaced, it cannot play a contraceptive effect, so it is recommended to take out the IUD within 3-7 days after menstruation and put it back in after the next menstruation, or use other contraceptive methods instead. 4. IUD embedment: mainly due to the long duration of the IUD in the body, the endometrium is stimulated and thickened, resulting in a part of the IUD growing into the myometrium. Women may experience soreness and discomfort in the lower back or lower abdomen, especially if the IUD is large or placed in a low position, the uterus will contract, causing contraction pain and symptoms such as incomplete menstruation, bleeding and inflammation of the reproductive tract. You should go to the hospital as soon as possible to remove the ring through hysteroscopy or laparoscopy to improve the success rate and accuracy and avoid unnecessary tissue damage caused by the retrieval device. 5. Ectopic pregnancy: The presence of chronic tubal inflammation makes the fallopian tube pass through poorly, resulting in the fertilized egg not being able to pass through the tube smoothly and thus bed in the fallopian tube, so causing the condition of ectopic pregnancy. When an ectopic pregnancy ruptures and bleeds, irregular vaginal bleeding, similar to menstruation, may occur. This condition should be treated with medication, such as methotrexate, under medical supervision, and also with conservative or radical surgical treatment. If you experience incomplete menstrual bleeding after wearing an IUD, you should go to the hospital promptly and seek symptomatic treatment under the guidance of your doctor.