Menstrual refers to the Levonorgestrel IUD system. Bleeding after half a month of having a levonorgestrel IUD system may be caused by menstruation, IUD side effects and inflammation. 1. Menstruation: If half a month after having a levonorgestrel IUD happens to be menstruation, then the bleeding may be menstruation, and there is no need to worry too much about this situation. 2. IUD side effects: levonorgestrel intrauterine sterilization system has more progesterone, which will inhibit the role of estrogen and make the uterine lining thinner, in the process there will be irregular bleeding, it is recommended that women can observe a few more days, pay attention to keep the vulva clean, and if the bleeding is more, it is recommended to go to the hospital in time for examination and treatment. 3. Inflammation: In the process of levonorgestrel intrauterine device system or after if you do not pay attention to hygiene, it is easy to cause infection bleeding, if in addition to bleeding, there are other manifestations of inflammation, such as fever, pain, etc., you need to go to the hospital in a timely manner, comply with the doctor’s instructions for anti-infection treatment. There are other reasons for the bleeding after half a month of the levonorgestrel IUD system, and it is recommended that women go to the hospital for a comprehensive examination and symptomatic treatment.