The normal menstrual cycle for women is usually 21-35 days, with a period of 3-7 days and a volume of 20-60mL, so generally 3-7 days of menstruation is considered standard normal. However, it can be considered normal for occasional 7-8 days without abdominal pain, fever, cervical disease or endometrial thickening. If the menstrual period is significantly longer than 10 days or more, it is considered abnormal and pregnancy should be ruled out first. If it is once in a while, anovulatory dysfunction and luteal insufficiency are considered more likely. If it occurs repeatedly the cause needs to be further clarified. It is necessary to consider whether bleeding is caused by cervical disease, whether bleeding is caused by endometritis or endometriosis, whether vaginal bleeding is caused by a history of caesarean section scarring or poor scar healing. So obvious menstrual abnormalities require further investigation of the cause, and an occasional abnormal menstrual period can be observed.