ABSTRACK RELATION BETWEEN PRIMERY DYSMENORRHEA WITH VOLUME AND CYCLES OF MENSTRUATION IN MEDICAL STUDENT UNIVERSITY OF RIAU By: Nopianti Sonia Background: Primary dysmenorrhea was a condition of abdominal pain and cramps during menstruation that was not based on a pathological condition. Primary dysmenorrhea occurs due to increased prostaglandin (PG) F2-alpha which was a cyclooxygenase (COX…