Suddenly 2 periods in 1 month, may be 2 periods with short interval, may also be related to other abnormal bleeding, can be divided into physiological and pathological reasons, can be roughly judged according to the symptom performance, such as accompanied by other abnormal performance, it is recommended to promptly seek medical examination. 1. Physiological causes: 1. Menstrual disorders caused by endocrine factors, including shortened menstrual cycle, low menstrual flow, accompanied by abdominal pain, dizziness, premenstrual irritability and other symptoms, hormone and ultrasound examination is feasible to confirm the diagnosis, and hormone medication should be applied as prescribed by the doctor; 2. Retreat bleeding: vaginal bleeding after menstruation due to emergency contraceptive pills, mistaken for menstruation, generally no treatment is needed, if bleeding is more than that, hemostatic medication can be applied as prescribed by the doctor; 3. 3. Ovulatory bleeding: If the second period occurs in the middle of 2 periods, it may be ovulatory bleeding, not real menstruation, due to fluctuation of estrogen level and endometrial shedding, causing vaginal bleeding, accompanied by mild lower abdominal discomfort or back pain. Ovulation test and basal body temperature measurement are recommended. Oral hormones and hemostatic drugs can be taken for treatment. Pathological causes 1. Pregnancy-related diseases: such as pre-eclampsia, spontaneous miscarriage, ectopic pregnancy, trophoblastic tumor, etc. The presence of pregnancy-related diseases can be clarified by HCG test and can be further identified by ultrasonography and treated accordingly. 2. Other gynecological diseases: such as chronic cervicitis, cervical cancer, endometrial cancer, etc., often have abnormal vaginal bleeding, which may be accompanied by vaginal They should go to hospital for colposcopy, cervical scraping, serum tumor markers, biopsy and other examinations to identify the cause and then the doctor will choose the appropriate treatment.