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Dysmenorrhea is a menstrual period and menstrual period before and after the emergence of cyclical lower abdominal pain, often occurs before menstruation and menstrual period, and occasionally occurred in a few days after menstruation. Primary dysmenorrhea is no obvious genital lesions dysmenorrhea. Primary dysmenorrhea occurs in 1-2 years after menarche. Although primarily affects young women with primary dysmenorrhea, but sustainable to 40 years. Dysmenorrhea is a Chinese medicine “by the line of pain” category. Uterine hypoplasia, uterine flexion, cervical stenosis, endometrial cast off (membranous dysmenorrhea), poor body posture and physical factors, allergy status, and mental factors can cause primary dysmenorrhea.