The main symptoms of IUD loss are lower back pain, falling sensation, mild abdominal pain, abnormal uterine bleeding, some people feel pain during sexual intercourse, and some people feel a trailing filament in the vagina, i.e. a foreign body sensation. Some people will have an increased risk of infection due to the downward movement of the IUD after it falls off, which may cause inflammation of the reproductive tract, while others may not feel anything. The main symptoms of vaginitis are heavy, yellowish, pus-colored leukorrhea, or itching and discomfort in the vulva. If any of these conditions occur, you should see your doctor as soon as possible.