What is normal menstruation? Normal menstruation has a regular cycle. The first day of bleeding in each cycle is the first day of the menstrual cycle, the interval between the first day of two menstrual cycles is the menstrual cycle, and the menstrual flow refers to the total amount of bleeding during the menstrual period of each cycle. A normal woman’s menstrual cycle usually lasts for 24-35 days, each menstrual period usually lasts for 2-7 days, and the average menstrual flow is 20-80ml. What is abnormal uterine bleeding? Abnormalities in the regularity of the menstrual cycle, frequency of menstruation, duration of menstruation, and volume of menstruation are all considered abnormal uterine bleeding. Abnormal uterine bleeding covers a wide range, including abnormal uterine bleeding caused by organic lesions (e.g. endometrial polyps, endometrial hyperplasia, malignant tumors of the endometrium, fibroids, adenomyosis, etc.) and abnormal uterine bleeding caused by endocrine dysfunction (i.e. dysfunctional uterine bleeding). And there are different treatment options for each of these causes. Abnormal uterine bleeding can be due to some abnormality in our “menstruation”, or it can be due to “non-menstrual” bleeding caused by organic pathology or endocrine disorders, but they are not normal menstruation, they are all abnormal uterine bleeding. Abnormal uterine bleeding usually affects women’s health to different degrees, and for women who have the desire to have children, some abnormal uterine bleeding may indicate that there are certain factors in the body that are not conducive to childbearing. Therefore, it is recommended that every woman keep a record of the start and end of each menstrual period, pay attention to the amount of menstrual flow and whether there are any special discomforts during the menstrual period. Long menstrual period: menstrual period >7 days), abnormal menstrual flow (excessive menstrual flow: menstrual flow >80 ml, scanty menstrual flow <5 ml), need to consult the doctor, who will give appropriate treatment according to the specific abnormalities.