Vaginal bleeding can be divided into normal bleeding and abnormal bleeding, among which menstruation and postpartum malignant dew are normal vaginal bleeding, except for abnormal bleeding, which can be in the vagina, cervix, uterine body and fallopian tubes, with uterine bleeding being the most common. The most common site of bleeding is the uterus. To determine whether it is menstrual or bleeding, you can judge by the bleeding situation, whether it is pregnancy or not, and the accompanying symptoms. I. Judgment of abnormal menstrual and vaginal bleeding Common causes of abnormal bleeding are ectopic pregnancy, miscarriage, and inflammation of the genitals. The methods of judging menstruation and vaginal bleeding are as follows: 1. bleeding: menstruation is usually regular, with bleeding time of 3-7 days, cyclical, and relatively stable volume; abnormal vaginal bleeding is usually irregular, the volume of bleeding may be more or less, and the bleeding time may be less than a few days or more than half a month; 2. whether pregnancy: women will experience menopause after pregnancy, and vaginal bleeding after pregnancy can be considered as miscarriage or ectopic pregnancy, not 3. accompanying symptoms: premenstrual period may have symptoms such as lower abdominal cramping, lumbago and diarrhea, the abdominal pain lasts for a short time and can be relieved; ectopic pregnancy may be accompanied by sharp tearing abdominal pain that cannot be relieved and patients may have shock symptoms; patients with vaginitis may be accompanied by abnormal leucorrhea and vulvar itching; patients with uterine fibroids often show symptoms such as prolonged menstruation, increased menstrual volume, along with lower abdominal mass and increased leucorrhea. The doctor will arrange the following examinations according to the complaints, medical history and physical signs: 1. gynecological examination: examine the vagina and uterine adnexa to determine the site of bleeding and whether there is any abnormality; 2. laboratory examination: such as blood routine, prothrombin, etc.; 3. imaging examination: such as ultrasound, CT, etc.; 4. blood test: such as hCG content, etc.; 5. 5.Pathological examination: such as diagnostic scraping, cervical biopsy, etc.