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Introduction: Many women in fertile period of their lives experience some bothering mental and physical symptoms that begin around 7-10 days before menses (lutheal phase) and cease in the first days of menstrual bleeding. After presentation of the Text Revision of the Fourth version of Diagnostic and Statistical Manual of psychiatric disorders (DSM-IV), these symptoms already known as Pre-menstrual syndrome (PMS) were called Pre-menstrual dysphoric disorder (PMDD). This process was associated with addition of some criteria about duration and intensity. The prevalence of PMS has been estimated to be about 40% to 70% but severe signs (PMDD) have lower prevalence. This study has evaluated the frequency of PMS and PMDD and some related factors in students of girls’ high schools in Kermanshah. Methods and Materials: In this descriptive-analytic study, 800 students of girls’ high schools were chosen by randomized cluster sampling. A researcher made questionnaire assessing PMS and PMDD according to DSM.IV.TR criteria as well as a demographic questionnaire were administered to participants. Data were analyzed running SPSS software -version 11.5. Findings: Frequencies of PMS and PMDD were 41.5% and 9.4% respectively. The disorder was more frequent in students older than 16 years old. Mood symptoms were the most frequent presentation, followed by physical and behavioral symptoms. There was a lower frequency of the disorder despite a higher frequency of the syndrome in students with highly educated mothers. The frequency of PMS was higher in students with positive family history.  Discussion: Because of the potential adverse effects of PMS and PMDD on academic achievement and mental health of students, the high frequency of these problems need urgent attention. Planning mental health evaluations and interventions is necessary for these age group students. Diagnosis of severe cases and referring them should be considered in such programs. 

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The aim of this study was to explain the modeling of premenstrual syndrome based on marital satisfaction and personality traits mediated by early maladaptive schemas. The research method is cross-sectional correlation. The statistical population of this study consisted of all married students of Tehran Azad University in 1399-1400, from which 400 people were selected by stepwise cluster sampling. In this study, the tools of premenstrual syndrome (Siah Baz et al., 2011), marital satisfaction (Enrich, 1998), neo-personality traits (Costa and McCray, 1992) and early maladaptive schemas (Young, 1988) were used, all of which had acceptable validity and reliability. SPSS-V23 and Amos-V8.8 software were used to analyze the data. Structural equation modeling was also used to answer the research hypotheses. Findings showed that the model has a good fit. The results also showed that marital satisfaction had a significant direct negative effect on premenstrual syndrome. Eagerness for new experiences, agreement and responsibility have had a significant direct negative effect on PMS. Neuroticism also had a significant negative direct effect on premenstrual syndrome. Marital satisfaction has had a direct negative effect on early maladaptive schemas. Eagerness for new experiences, agreement, and responsibility have had a significant direct negative effect on early maladaptive schemas. Neuroticism also had a significant negative direct effect on premenstrual syndrome. Early maladaptive schemas had a direct effect on premenstrual syndrome. This means that the level of premenstrual syndrome increases with the increase of early maladaptive schemas. Therefore, paying attention to the mentioned variables in prevention and designing more appropriate therapies will help researchers and therapists