If suddenly the amount of menstruation becomes particularly low, it may be due to the following reasons: 1, there is a history of sexual intercourse without contraception, first of all, to exclude the possibility of pregnancy, some people have a preeclampsia also appear a small amount of vaginal bleeding, mistaken for menstruation, in fact, is not a menstruation, but abnormal bleeding, it is recommended to do a test for early pregnancy or blood test blood HCG. 2, it may be the case that in coming to the When you drink a lot of frozen drinks to make blood vessel contraction, so it will cause the menstrual flow is particularly low, you can drink hot brown sugar ginger water, have the effect of driving cold and warming the uterus, it will improve the menstrual flow, drink for 3 days will receive relatively good results. 3, may be subjected to some kind of shock suddenly caused by a high degree of nervousness or fear of the psychology, can also lead to menstrual flow is particularly low, it is recommended to combine with the corresponding clinical history analysis, and then use medication to regulate the flow. It is recommended to analyze the situation with the corresponding clinical history, and then use medication to regulate.