Having 2 periods in a month may be related to physiological factors, or it may be caused by endocrine disorders, organic gynecological lesions or taking emergency contraceptive pills. 1. Physiological factors: under normal circumstances, women’s menstrual cycle is an average of 28 days, 7 days in advance or delayed is normal, if the beginning of the month to have a menstrual period, to the end of the month may be again menstruation, which manifests itself as a month of two menstruation, and occasionally appear such a situation for normal phenomena. 2. Endocrine disorders: for example, long-term mental overstress, anxiety, excessive psychological pressure, suffering from psychological trauma, etc., may lead to endocrine disorders, resulting in large changes in the menstrual cycle, which may show twice a month menstruation. 3. Organic gynecological lesions: cervical polyps, endometrial lesions, endometrial polyps and other diseases may lead to non-menstrual bleeding, which may result in two menstrual periods a month, and may be accompanied by menstrual dribbling and other manifestations. 4. Taking emergency contraceptive pills: If no contraceptive measures are taken during intercourse and emergency contraceptive pills are taken after intercourse, it may lead to two periods in a month. The main reason is that after taking the emergency contraceptive pill, it may cause the hormone level in the body to increase for a while, and when the hormone level decreases, it may cause withdrawal bleeding, resulting in two menstrual periods in a month. If there are other reasons for having two periods in a month, it is recommended to consult a doctor as soon as possible to confirm the cause and give targeted treatment if there is any obvious discomfort.