Half a month to a period may be ovulation bleeding, may also be taking birth control pills, polycystic ovary syndrome and other endocrine disorders, or uterine fibroids, endometrial polyps, reproductive tract tumors, gynecological inflammation caused by shortening of menstrual cycle, need to consult a doctor in time to clarify the condition of the targeted treatment. 1. Pregnancy: Women’s menstrual cycle is usually 21-35 days, abnormal menstruation, first of all, should be clear whether there is a pregnancy, early pregnancy has the possibility of abortion. 2. Endocrine disorders: polycystic ovary syndrome, fatigue, etc. can lead to endocrine disorders, need to use drospirenone ethinyl estradiol tablets, ethinyl estradiol cyproterone tablets and other adjustments to menstruation. In addition, there may be vaginal bleeding after taking emergency contraceptive pills, if the amount of bleeding is not more than the amount of menstruation, it can be temporarily observed. 3. Organic diseases: uterine fibroids, endometrial polyps, etc. may cause increased menstrual flow and shortened cycle, especially submucous fibroids, which may cause anemia, and can be treated with medicines or surgery according to doctor’s instructions. Cervical cancer, endometrial cancer or ovarian cancer may lead to abnormal bleeding, which should be treated with surgery or radiotherapy as per doctor’s prescription after the condition is clarified. 4. Gynecological inflammation: Inflammation of female reproductive tract may lead to abnormal bleeding, accompanied by lower abdominal discomfort, abnormal leukorrhea, etc., which should be treated with anti-infective drugs as prescribed by the doctor, often choosing metronidazole, levofloxacin and cephalosporins. If a woman has an abnormal amount of menstruation or an abnormal cycle, there are many reasons for this, so she should actively consult the gynecology department of a regular hospital and follow the doctor’s instructions for treatment, rather than judging and treating it on her own, so as not to delay or aggravate her condition.