IntroductionPremenstrual syndrome is a common disorder in reproductive age and it is associated with decreased quality of life in women. In view of various factors contributing to outbreak of PMS (premenstrual syndrome) among women, the present study intended to compare lifestyles of university students with and without premenstrual syndromes living in dormitories of Qazvin University of Medical Sciences in 2015.MethodsThe descriptive cross-sectional study recruited 200 university students with and without PMS from students living in dormitories. Data were collected using questionnaires of premenstrual symptoms, questionnaires for diet, perceived stress, and unhealthy behavior. Data were analyzed using descriptive statistics, independent samples t-test, Mann-Whitney, Chi-square, and logistic regression in SPSS version 23.ResultsThe results showed that nutrition style (p=0.001), perceived stress (p=0.001), and exposure to passive tobacco smoke (p=0.001) were different between the two groups. Logistic regression analysis showed that nutrition style (p=0.001, OR=0.861), exposure to passive tobacco smoke (p=0.008, OR=2.059), and stress (p=0.001, OR=1.088) were different in both groups.ConclusionThe research results proved that lifestyle, especially healthy eating habits, and decreasing stress and unhealthy behavior can influence PMS. Therefore, interventions are recommended to improve PMS symptoms.