IUDs can harm women by changing their menstrual periods, changing the position of the ring, pregnancy with the ring, and infection. IUD is a method of contraception usually used by women, and it needs to be performed 3-7 days after menstruation is clean and contraindications to IUD are ruled out. IUD has no obvious harm to most women, but some women may experience some harm to their body after IUD, such as; 1. Ring position change: after the IUD, women may have the ring position shifted downward, and individual serious cases may also have the ring perforated into the abdominal cavity and so on, which will bring serious adverse consequences. The ring needs to be removed as soon as possible. 2. Pregnancy with the ring: Due to the displacement of the intrauterine ring, pregnancy with the ring is not uncommon in clinical practice, and the ring can be removed together with the abortion. 3. Infection: If the IUD is not sterilized properly, or if the body’s resistance is low, or if the patient has intercourse too soon after the operation, it may lead to pelvic infection after the IUD is inserted, which may cause increased secretion, pain in the lower abdomen, lumbar pain and other adverse reactions. Need to use antibiotic anti-inflammatory treatment, such as ornidazole, cephradine and so on. 4. Menstrual changes: After the IUD, due to the stimulation of the endometrium by the ring, it may lead to heavy menstruation, prolonged menstruation, abnormal uterine bleeding, etc. If the symptoms cannot be relieved, it is recommended to take timely treatment. If the symptoms can not be relieved, it is recommended to consult a doctor in time and remove the ring if necessary. If serious adverse reactions occur after the IUD, it is recommended to go to the hospital in time.