There may be various reasons why menstruation does not clear for a month, it may be due to incomplete menstrual bleeding, or it may be related to other bleeding conditions, such as pregnancy-related diseases, gynecological inflammation or other related gynecological diseases, which need to be further examined and judged according to different situations and treated accordingly. 1. pregnancy-related diseases: such as pre-eclampsia, spontaneous abortion, ectopic pregnancy, trophoblastic tumor, etc., can be identified by blood HCG and ultrasound examination. The diagnosis should be confirmed by endometrial biopsy and microscopic examination of secretions, and the use of broad-spectrum antibiotics combined with anti-anaerobic bacteria as prescribed by the doctor. 3, cervical diseases: such as cervicitis, cervical erosion, cervical polyp, cervical precancer, cervical cancer, etc., need to perform cervical TCT plus HPV examination, cervical biopsy if necessary; 4, other diseases: such as endometrial polyps, dysfunctional uterine bleeding, submucosal fibroids, adenomyosis, etc., may also have the performance of excessive menstruation and prolonged menstruation, or accompanied by the discharge of foul-smelling bloody Symptoms of discharge, vaginal ultrasound and hysteroscopy should be done promptly, and medication and, if necessary, surgery can be considered.