Mannuelle ring is the levonorgestrel intrauterine sterilization system. Bleeding from the placement of levonorgestrel intrauterine sterilization system may be caused by irritation of the uterine lining, displacement of the ring, and so on. 1. Stimulation of the uterine lining: most people will experience spotting bleeding within six months after placing the levonorgestrel IUD. This is mainly due to the high efficiency of progesterone contained in the levonorgestrel IUD system. Progesterone will repeatedly stimulate the uterine lining, thus causing uterine spotting bleeding. 2. Ring displacement: It is possible that the levonorgestrel IUD system may be displaced, in which case the symptoms of vaginal bleeding may persist. After placing the levonorgestrel intrauterine device system, there will be bleeding, there may be other reasons, it is recommended to consult a doctor in a timely manner, improve the relevant examination, under the guidance of a professional doctor to clarify the cause of the disease, targeted treatment.