Mucus filaments are a component present in urine. When mucus filaments are high at 1000p/ul, it may be related to IUD, or it may be caused by being in the ovulation period, the presence of inflammation in the reproductive tract, and so on. 1. IUD: After the IUD is inserted, the uterus will be stimulated, resulting in increased secretions, which, when mixed with urine, will make the mucus filaments as high as 1000p/ul. 2. During ovulation: If a woman is dealing with ovulation, the secretions will physiologically increase and be thicker, and may mix with urine, causing mucus filaments to reach 1000p/ul. 3. Inflammation of the reproductive tract: If there is inflammation of the reproductive tract, it may lead to an abnormal increase in vaginal secretions and more viscous, making the mucus filaments in urine examination 1000p/ul. When the mucus filaments are as high as 1000p/ul, there may be other reasons, it is recommended to go to the hospital in time, under the guidance of the doctor to take standardized methods of treatment, in order to promote the alleviation of the discomfort of the situation.