The specific reasons for the sudden low volume of the patient’s period are as follows: 1. Pregnancy: women who have sex should first rule out whether they are pregnant, because after pregnancy, some people also have bleeding, but not normal menstruation, it may be a pre-eclampsia or spontaneous miscarriage. 2. Hormonal abnormalities: the low volume of menstruation that excludes pregnancy may generally be a menstrual disorder, mainly to check the function of the ovaries, you can check the sex hormones, ultrasound monitoring If the function of the ovaries is good, you can observe it or use traditional Chinese medicine to regulate it. If the ovarian function is not good, you need to use estrogen and progestin supplementation therapy. Before supplementing hormones, you need to do a medical examination to exclude contraindications to hormone application, and use them again if there are no contraindications.