If the menstrual cycle is regular, the amount of menstruation at a time is less than 20ML, which is called less menstrual flow, causing oligomenorrhea: First, the pituitary gland function is low, resulting in insufficient estrogen secretion in the ovary and insufficient endometrial hyperplasia; Second, the pathological changes of the uterus itself, endometrial dysplasia, endometrial tuberculosis, and excessive curettage have damaged the endometrium; Third, individual differences. Bazhen Granules and Xiaoyao Granules mainly regulate the hormone level in the body and increase the menstrual flow, but they will generally recover after stopping taking drugs. Therefore, it is recommended that you go to the gynecology department of a regular hospital for relevant examination, and make clear the reasons before symptomatic treatment.