Bloody discharge on the eighth day of menstruation is normal, suggesting that menstruation has not yet ended, or consider endometritis, uterine fibroids and other diseases. 1. Normal: Normal women’s menstruation lasts from two to eight days. If a woman does not experience any discomfort and still has bloody discharge on the eighth day of her menstruation, it is a normal phenomenon and there is no need to worry too much. 2. Endometritis: Endometritis can be caused by pathogen infection, sex during menstruation, frequent vaginal douching and other factors. Patients may have lower abdominal pain, fever, abnormal vaginal bleeding, high fever, abdominal distension, nausea and other symptoms, and during menstruation, there may be prolonged menstrual period, manifested as bloody discharge on the eighth day of menstruation. 3. Uterine fibroids: the etiology of uterine fibroids is related to genetic susceptibility, sex hormone level and other factors. Patients will have prolonged menstruation, accompanied by increased leukorrhea, lower abdominal swelling, back pain and other symptoms, and some patients may have bloody discharge on the eighth day of menstruation. There are many reasons for bloody discharge on the eighth day of menstruation, so it is recommended to find out the cause of the problem in time and actively cooperate with doctors to take relevant treatment measures.