The normal time of the days of brown discharge of menstrual trailing is to be judged by the number of days of red menstruation. If the red menstrual blood is discharged for 3 days, a brown trailing within 4 days is normal. If the red menstrual blood is discharged for 2 or 2 days, the brown trailing is within 5 days is normal. The brown discharge at the end of menstruation is a normal physiological phenomenon, caused by the low menstrual volume near the end of menstruation and the oxidation of menstruation in the vagina. If there is brown discharge for a longer period of time, it is necessary to exclude organic lesions of the uterus, such as endometrial polyps, cervical lesions, submucosal fibroids of the uterus, etc. After ruling out organic lesions, the presence or absence of ovulation should be further determined. If ovulation exists, abnormal uterine bleeding with ovulation, including luteal insufficiency and luteal atrophy, should be considered. Patients with prolonged menstrual trailing brown discharge are advised to go to the hospital gynecology department for transvaginal ultrasound examination as well as gynecological consultation, and also to avoid spicy, cold and other stimulating organisms.