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Objective: To explore the sensitization acupoints of women with primary dysmenorrhea (PD) by comparing infrared radiation temperatures between acupoints and non-acupoints., Methods: We tested 10 acupoints of every woman with PD and healthy subjects on premenstrual, menstrual, and postmenstrual days using an infrared imaging device. The primary outcome was the absolute value of body surface temperature difference (AVTD) between the left and right sides of the same testing point., Results: A total of 58 PD patients and 57 healthy volunteers completed the test from May 2016 to May 2017. Compared with the healthy group, we observed a significant reduction and increase in the AVTD in Taichong (LR3) and Sanyinjiao (SP6), respectively, during menstrual days in the PD group (= 0.01; = 0.04); while during postmenstrual days, all AVTDs of Shuiquan (KI5), Diji (SP8), and Xuehai (SP10) were diminished in the PD group (= 0.01; = 0.03; = 0.01, respectively). No significant differences in AVTD were detected at any other points or testing times., Conclusions: Compared with the healthy group, the AVTDs of Taichong (LR3), Sanyinjiao (SP6), Shuiquan (KI5), Diji (SP8), and Xuehai (SP10) at menstruation-relevant points of PD patients were sensitized, providing a reference for the selection of acupoints in the treatment of PD.