Objective To observe the reflection of dysmenorrhea in acupoint Sanyinjiao(SP 6)region(body surface)so as to verify the relationship between the acupoint and uterus.Methods A total of 60women(15-35 years in age)including30primary dysmenorrhea patients(test group)and 30 healthy subjects(control group)were enrolled in the present study.The visual analog scale(VAS)score and mechanical pain threshold of bilateral Sanyinjiao(SP 6)regions were detected to assess changes of skin sensitivity in subjects undergoing menstrual pain and in the non-menstrual period.Results The VAS value in the menstrual period of test group was significantly higher than that in the non-menstrual period of the same one group and that in the menstrual period of the control group(P<0.01)

and the pain threshold in the menstrual period of test group was significantly lower than that in the non-menstrual period of same one group and that in the menstrual period of the control group(P<0.01).No significant differences of both VAS value and pain threshold were found between the two groups in the non-menstrual period(P>0.05).Conclusion An obvious tenderness at Sanyinjiao(SP 6)exists in women undergoing primary dysmenorrhea

suggesting a close correlation between Sanyinjiao(SP 6)and uterus.