The causes of dysmenorrhea in Chinese medicine can be summarized in the following aspects: 1. actual evidence, actual evidence of the cause of pain caused by stagnant blood stagnation in the uterus due to depression, easy anger, qi stagnation and blood stasis; pain caused by cold evil, eating cold before and after menstruation or after childbirth, or rain, wading, swimming before and after menstruation, or living in a wet place for a long time; pain caused by stagnant blood stasis in the uterus due to the usual personal This is the main pathogenesis of the actual disease, and is the main cause of the disease. 2. The deficiency evidence is mainly seen in two aspects: the patient’s usual weakness of the spleen and stomach, and unclean diet, which causes a relative deficiency of qi and blood, resulting in pain caused by the loss of the uterus’ ability to moisten the uterus. The pain is caused by the loss of moistening of the uterus; the patient’s congenital deficiency of endowment, congenital deficiency of kidney qi, or the loss of moistening of the uterus caused by damage to kidney qi due to multiple births and room strain. Both of these causes cause pain when the uterus does not glory. The solid evidence is pain if it does not pass through, and the deficiency evidence is pain if it does not glory, both of which can cause dysmenorrhea. The reason why pain is not normally caused but is caused during menstruation is that when menstruation is not in progress, the Qi and blood of the uterus are calm and the causative factors are not sufficient to cause stagnation or deficiency of Qi and blood of the uterus, so it does not cause pain normally. Before and after menstruation, when the sea of blood changes suddenly from full to overflowing, and when the Qi and blood are in full bloom, the Qi and blood of the uterus change more rapidly than usual, which can easily cause disturbance by pathogenic factors, plus physical factors, causing the Qi and blood of the uterus to run poorly, or to lose moistening and cause obstruction, or pain caused by dishonor. The above is the cause of dysmenorrhea from the perspective of Chinese medicine.