Low menstrual flow may be caused by cold, polycystic ovary syndrome and luteal insufficiency, which can be adjusted by adjusting lifestyle habits and using medications (such as drospirenone ethinyl estradiol). 1. Cold: If the body is stimulated by cold, it may lead to endocrine fluctuations, which may cause abnormal shedding of the uterine lining, resulting in low menstrual flow, which can be alleviated by paying attention to warmth and eating more warm food. 2. Polycystic ovary syndrome: at this time, you should control your weight, avoid obesity, and use drospirenone ethinyl estradiol and other medications as prescribed by the doctor to regulate and improve the menstrual cycle and the amount of menstruation. 3. Luteal insufficiency: luteal insufficiency can lead to endometrial growth disorders, resulting in low menstrual flow, can be prescribed to use drugs such as dydrogesterone treatment. If you have a low menstrual cycle, you should consult a doctor and choose the appropriate method to deal with it under the doctor’s guidance, avoiding unauthorized use of medication.