Title: Experiences and Attitudes of Senior Medical School Students Regarding Menstrual Health: a Cross – sectional Study. Background: Menstruation is a physiolgical breakthrough bleeding from the uterus that occurs due to the correct cyclical exchange of endogenous hormones and also represents the beginning of the menstrual cycle. Menstrual health is a state of complete physical, mental and social well – being, not just the absence of disease in relation to the menstrual cycle. Menstrual pain is the leading complaint faced by adolescent girls. Most adolescent girls with menstrual pain are suffering from primary dysmenorrhea. Aim: The aim of this work is to examine the experiences and attitudes of female students in the final years of secondary medical schools about menstrual health. The aim of the research is also to test the following stated hypotheses: most of the respondents (more than 50%) took painkillers during menstruation (H1), most of the respondents (more than 50%) learned about menstruation via the Internet (H2), most of the respondents (more than 50%) have frequent mood swings during menstruation (H3). Methods: A cross – sectional study was conducted. The respondents were final (fifth) grade students from three secondary medical schools in Zagreb. The data was collected using a paper questionnaire during April 2024. A descriptive analysis was carried out from the collected data. Results: 176 female final year students from three secondary medical schools in Zagreb participated in the research. The first part of the data analysis is presented with the parameters of descriptive statistics, while the evaluation of the hypotheses was carried out using the chi – square test. It has been proven that most of the test subjects took painkillers during menstruation and that they have more frequent mood swings during menstruation. Also, most of the respondents learned about menstruation from the female part of the family and not from the Internet. Conclusion: The results show that hypotheses H1 and H3 are confirmed, while hypothesis H2 is rejected. This research can provide insight into the experiences and attitudes of schoolgirls about menstrual health in adolescents, as well as for raising awareness about menstruation and menstrual cycles and their deviations.