Mannuel Ring refers to the Levonorgestrel IUD system, an intrauterine device with progesterone, which slowly releases a small dose of levonorgestrel into the uterine cavity every day, which may cause symptoms such as decreased menstrual flow, prolonged periods, and amenorrhea. The levonorgestrel IUD system contains a slow-release contraceptive pill and therefore affects the thickness of the uterine lining to avoid overgrowth of the lining and symptoms such as decreased menstrual flow, prolonged menstrual periods, and amenorrhea. The levonorgestrel IUD system contains progesterone, which has the potential to cause nausea, vomiting and other uncomfortable digestive symptoms in the body. If a woman experiences discomfort during the IUD process, she should go to the hospital for a timely examination to clarify whether the specific location of the levonorgestrel IUD system has changed, and under the guidance of the doctor.