The causes of unclean and dripping menstruation can be divided into the following aspects: 1. Functional causes, mainly caused by dysfunction of the reproductive endocrine axis, mostly related to ovulation. Poor egg quality and insufficient luteal function after ovulation can cause menstrual dripping and bleeding. 2, organic causes, such as uterine fibroids, ovarian tumors, uterine cancer, endometrial cancer, endometrial precancerous lesions, endometrial polyps, etc. 3, intrauterine devices, that is, with the ring, foreign bodies and improper use of hormonal drugs, such as taking emergency contraceptives. 4, inflammation of reproductive organs, such as cervicitis, uterine 5. abnormal pregnancy, such as miscarriage, ectopic pregnancy, poor uterine regeneration, placental residue, etc. 6. systemic diseases, such as hematologic diseases, hyper- or hypothyroidism, liver and kidney failure, etc. In case of unclean menstruation, it is important to seek medical attention and find the cause.