Introduction: The menstrual disorder is very frequent complaint in adolescence age. Our aim of this study is to estimate the prevalence of menstrual disorders in teenage girls and associated with sport. Method: This cross sectional study was conducted in 8 urban and rural areas in Mazandaran province in north of Iran. One thousands and two hundred teenage girls (14-17 years), 370 girls from rural areas and 690 girls from urban areas entered in our study. Data was collected with questionnaire. We used descriptive statistics, chi- test and in depended T test. Significant level of this study was P<0.05. Result: The prevalence of menstrual disturbance in urban girls was 13.2% and in rural girls were 8.6%. According to chi- test we can say there is significant relation between menstrual disorder and place of residency (p=0.02). Relation between sport and hypo menorrhea (p=0.191), polymenorhea (p=0.077), metrorrhaghia (p=0.423) were not significant; but the relation between oligomenorhea (p=0.006), amenorrhea (p=0.000) and menorrhagia (p=0.002) were significant. Conclusion: Menstrual disorder is common in adolescence and regular exercises can reduce some kind of menstrual disorder.
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