Generally speaking, the main reason for less menstrual flow is endocrine disorder, which leads to low endocrine function, uterine hypoplasia, tumors and other diseases, resulting in less menstrual flow or even amenorrhea, and the probability of infertility will increase. The main causes of menstrual disorders are endocrine dysfunction caused by endocrine disorders, or systemic diseases and local diseases of reproductive organs. It is mainly caused by seven emotions or exogenous pathogens and six evils, congenital deficiency of kidney qi, overwork, overwork, etc., and the dysfunction of kidney, liver and spleen, and the imbalance of qi and blood lead to the injury of meridians of Chong and Ren, which develops into irregular menstruation and less menstrual flow. Experts said in Yangshengtang that less menstrual flow can be adjusted with Ejiao Polygonatum Pills.