interferes in their functions and different frequencies of PMS have been reported in literature
and higher rates of it in college students, we decided to study its epidemiology in students of
Mashhad University of Medical Sciences (MUMS). Methods and Material: In this descriptive
study, 210 female students of MUMS filled the demographic (including age, marriage status
and level and field of study) and PMS questionnaire. The results were analyzed by chi …