There are various reasons for the sudden onset of 2 menstrual periods in a month, and it is considered that it may be a normal physiological phenomenon of ovulation bleeding. Under normal circumstances, if the patient is about 14 days before the next menstrual period, there is a curry-colored discharge with blood, then it is considered that the patient may be in the ovulation period, and thus bleeding symptoms, which is a normal phenomenon, without the need to use special means of treatment. In addition, the following factors can not be ruled out: 1, perimenopause: common in middle-aged women, is the manifestation of the early failure of ovarian function, the patient will appear irregular menstrual cycle, the phenomenon of 2 times a month menstruation, which is a normal physiological response, generally no need to be treated; 2, birth control device stimulation: if the patient in the uterus to place a birth control device, it is possible to menstruation after menstruation, which is mainly the birth control device will inhibit uterine contraction, thus causing uterine bleeding. Usually, most patients’ symptoms disappear on their own after the body adapts to the birth control device. If the patients’ menstrual situation fails to improve, they need to go to the hospital in time to take out the birth control device; 3. Contraceptive side effects: Since contraceptives have the effect of inhibiting the growth of endometrial lining, when the patients take them, they may disrupt the endocrine environment, resulting in a 2-times menstruation situation. Usually, the symptoms will be relieved by themselves after stopping the medication or after the effect of the medication has disappeared; 4. Menstrual disorders: patients who are in the state of staying up late for a long period of time, being overly fatigued, having poor sleep quality, having emotional anxiety, catching a cold and so on, may lead to endocrine disorders, which will trigger menstrual disorders, and the patients will have the symptom of having 2 periods in a month. It is recommended that ibuprofen and other drugs should be used to relieve pain, as well as estrogen, progesterone single or combined treatment to achieve the role of endocrine regulation; 5, uterine diseases: endometriosis, endometritis, uterine fibroids and other uterine diseases, which can cause lower abdominal pain, leukorrhea and shortening of the menstrual cycle, and so on, so that there is the possibility of having two periods in one month. Endometritis is the most common and is mainly caused by pathogenic bacterial infection. It is recommended that the patient consult the doctor in time, under the guidance of the doctor, the use of ceftriaxone sodium, cefoxitin sodium, tetracycline, metronidazole and other antibiotics for treatment, the amount of pus in the uterine cavity of the patient, but also need to use the uterine cavity drainage treatment. If the patient exists intrauterine foreign body, it is necessary to do the relevant excision surgery; 6, hyperthyroidism: the patient’s nervous, circulatory, digestive and other systems of increased excitability, hypermetabolism, in addition to the typical symptoms of neck enlargement, the female patients will also appear in the low menstrual flow, the abnormal phenomenon of 2 menstrual periods in 1 month. Patients need to follow the doctor’s instructions to use methimazole, propylthiouracil, carbimazole and other drugs, as well as atenolol, metoprolol and other drugs to control the disease.