You generally cannot have an IUD if you have vaginitis because it may cause upstream infections such as cervicitis and pelvic inflammatory disease. Vaginitis refers to the infection of bacteria, mold or trichomonas and other pathogens in the vagina. IUD is a surgical operation, and the device needs to be delivered into the uterine cavity from the vagina. If the device is placed inside the uterus in the case of vaginitis, the bacteria in the vagina may be brought into the uterus during the operation, causing upward infection, leading to cervicitis, or even pelvic inflammatory disease, etc. If a woman with vaginitis wants to have an IUD, she needs to have her vaginitis treated before she has an IUD. Women with vaginitis who want to have an IUD need to have the vaginitis treated before having the IUD inserted, and are advised to consult a doctor if they experience any discomfort such as menstrual changes or back pain after having the IUD inserted.