The goal of this non-invasive interventional study is to explore the university students' experience of living with primary dysmenorrhea and evaluate the effect of acupuncture at the Sanyinjiao point on their physiological discomfort. The main questions it aims to answer are:

• Is there any difference in pain before and after the intervention of the Sanyinjiao point acupressure for dysmenorrhea among female college students?
• Is there any difference in the average number of Menstrual Distress Questionnaire scale before and after Sanyinjiao acupressure in female college students with dysmenorrhea? Participants will be acupressure at Sanyinjiao point triple times during the study.

This study will employ a quasi-experimental research design, using pre- and post-intervention surveys in intervention. In the universities of central Taiwan as a place to collect cases. Target 50 university students with primary dysmenorrhea will be recruited by using a purposive sampling. After taking the informed consent and basic information of the study participants, the observation will be measured before and after the intervention of the Sanyinjiao point acupuncture, which were performed during two consecutive menstrual cycles (eight days per cycles). The data collection will be obtained by demographic questionnaire, the Visual Pain Scale (VAS) and the Menstrual Physiological Infrequency Table (MDQ). Descriptive statistics (mean, standard deviation (SD), frequency, mean difference), Chi-square test and ANOVA statistical testswere used for data analysis.

Inclusion Criteria:

A. Dysmenorrhea in the past six months, lower abdominal pain one or two days before menstruation or the first and second day of menstruation.

B. Dysmenorrhea will affect women's daily life, and those whose VAS score is greater than 5 points are female college students with moderate to severe pain.

C. The menstrual cycle is 21-35 days, and menstruation lasts 3-7 days. D. Female college students aged 18~30

Exclusion Criteria:

A. Pregnant women or women who have given birth, breastfeeding, taken contraceptives, and have contraceptive devices.

B. Previous uterine or pelvic surgery, severe uterine and pelvic infection. C. Have a major disease: cancer, heart disease, hyperthyroidism, etc. Strong pain will affect the performance of menstrual pain and other diseases.

D. There is wound, inflammation or skin damage on the skin of Sanyinjiao acupoints on both sides.

E. Use of traditional Chinese medicine for dysmenorrhea in the past three months.