The right lower abdominal pain after IUD should be considered whether it is related to the occurrence of appendicitis, tubo-ovarianitis or ovarian cyst torsion. 1. Appendicitis: after IUD, if acute appendicitis occurs, metastatic lower right abdominal pain can occur, that is, abdominal pain begins in the epigastrium, gradually moved to the umbilicus, the lower right abdomen, or in the beginning of the lower right abdominal pain, early nausea, vomiting and other gastrointestinal symptoms. 2. Tubo-ovarianitis: commonly known as adnexitis, intrauterine operations or reproductive tract infections can lead to its occurrence, with lower abdominal pain, increased vaginal discharge or localized pressure and pain. 3. Ovarian cyst torsion: with a history of ovarian cysts, after the IUD, it can cause severe pain in one side of the lower abdomen due to the change of body position, which can be accompanied by anal swelling, nausea and vomiting due to pain stimulation. If right lower abdominal pain occurs after IUD, it is recommended to consult a doctor in time and treat the cause and symptoms.