Materials and Methods: This randomized clinical trial study was conducted on 70 students aged 15-18 years with primary dysmenorrhea. They were randomly assigned into 4 different groups: stretch group (n = 19), massage group (n = 19), combined group (n = 21), and control group (n = 19). To evaluate the effect, the treatment was applied as 8 weeks of physical activity, 3 sessions a week, twice a day, 10 minutes for massage group, 20 minutes for stretching group and 20 minutes for combination group and without exercise for control group on primary dysmenorrhea. Moreover, to measure the intensity and severity of pain McGill?s questionnaire were used.

Results: The results revealed that performing a regular physical activity led to a significant reduction in the severity of dysmenorrhea pain (P < 0.05), Pain Rate Index (PRI ) (P < 0.05), visual analog scale (VAS) (P < 0.05), present pain intensity (PPI) and total pain according to McGill?s short form questionnaire (TP) (P < 0.05), and volume of bleeding (P < 0.05) in the 3 groups.

Conclusion: The results of this study indicated that lifestyle modifications including some physical activities would decrease the quality and quantity of pain in primary dysmenorrhea such as duration and intensity of pain.