This study was a double blind clinical trial, conducted on 101 students of Shahid Beheshty University of Medical Sciences. The study participants randomly assigned in terms of imagery severity dysmenorrhea in two groups of 50 and 51 persons. The persons were assessed in study groups regarding: age, menarche age, the early dysmenorrheal age, body mass index, graduate and parent's job, length; space and quantity of period in similar groups. Fenugreek seed's capsule content of 900 mg seed powder prescribed 3 times a day and 2- 3 capsules duration first three days of menstrual period and for persons in control group prescribed placebo (similar capsule with same recipe content starch) in two cycles. Severity of pain compared base on spectrum analog scale 0 to 10 centimeter (Mcgill scale) and systematic signs used verbal multidimensional scoring system said before study and duration 2 continuous cycles.