The reasons for this are endocrine disorders, ovulatory bleeding, chronic cervicitis, cervical polyps, precancerous lesions of the cervix and so on. 1, endocrine disorders: common in estrogen and progesterone secretion abnormalities, can appear menstrual cycle disorders, irregular vaginal bleeding and other symptoms, should check the sex hormone six clear diagnosis. You should pay attention to personal hygiene, abstain from sex, eat nutritious and easy-to-digest food, and avoid spicy, stimulating and cold food. 2. Ovulatory bleeding: A short drop in estrogen level due to ovulation, which causes endometrial shedding and regular vaginal bleeding, accompanied by mild lower abdominal discomfort or lumbar soreness. It is recommended to do ovulation test and basal body temperature measurement to confirm the diagnosis, and oral estrogen and hemostatic drugs can be taken. They often have abnormal vaginal bleeding, menstrual disorders and other symptoms, and can be accompanied by lumbosacral discomfort, and should be diagnosed by hysteroscopy and colposcopy. 6.Other: endometrial thickening and endometrial polyp may also have the symptoms of irregular vaginal bleeding, usually B-ultrasonic examination can directly reflect the abnormality, if necessary, assisted endometrial biopsy and hysteroscopy to confirm the diagnosis.