If it is the first time that a woman has a menstrual period and she is having sex, she should consider whether pregnancy is causing a small amount of irregular vaginal bleeding, such as an aura of miscarriage, or an ectopic pregnancy with a small amount of vaginal bleeding. If pregnancy is ruled out and women have very little menstrual flow, the following aspects should be considered: 1. If women have undergone uterine surgery before, such as abortion or curettage, and their menstrual flow becomes less and less or suddenly becomes less and less, we should consider that the abortion or curettage causes cervical and uterine adhesions that lead to low menstrual flow; 2. If women have less and less menstrual flow, and if it is accompanied by postponed menstruation, we should consider endocrine-related Some diseases, such as polycystic ovary syndrome or hyperprolactinemia, can cause less and less menstruation, accompanied by posterior menstruation, which may even lead to amenorrhea if not actively treated; 3. Women with poor health, deficiency of qi and blood or kidney yang, may also cause a deficiency of essence and blood, resulting in a low menstrual flow. In this case, Chinese medicine is needed to treat the problem, which is usually regular and has no history of surgery.