Introduction: Contraception represents an important part of women's reproductive health. Despite the high effectiveness of available methods, side effects remain one of the most
common reasons for switching or discontinuing them. A growing body of research suggests that hormonal contraception, through its effect on the microbiota, has effects extending beyond the reproductive system. Purpose: The purpose of this master's thesis was to examine the role of contraceptive side effects in women's choice, use, and persistence with their selected contraceptive method, and to explore their association with perceived changes in vaginal, urinary, and digestive health as possible indicators of changes in the microbiota. Methods: The research was based on a quantitative research approach. In addition to a review of domestic and foreign professional and scientific literature, an online survey was conducted among 107 women aged 18 and over who had ever used any form of contraception. A random sample was collected via social networks between April 23 and June 3, 2026. Data were analyzed using descriptive statistics and non-parametric statistical tests.Results: Side effects were reported by 28% of current contraceptive users, with these being significantly more common among hormonal than non-hormonal methods (52% vs. 5%). The most frequently reported were mood changes (59%), weight gain (53%), and irregular bleeding (47%). Just over one-quarter of the respondents reported changes related to vaginal, digestive, and urinary health.Greater intensity of side effects was associated with
lower satisfaction and more frequent switching or discontinuation of the method. Almost a third of respondents were poorly informed or not informed at all about possible side effects before starting use. Discussion and conclusion: The results show that side effects significantly affect satisfaction with a contraceptive method and its switching or discontinuation. Perceived changes in vaginal, urinary, and digestive health suggest a possible association between hormonal contraception and changes in the microbiota;
however, due to the design of the study, these associations cannot be directly confirmed. The findings highlight the importance of individualized contraceptive counseling that, in addition to effectiveness, also takes into account side effects, health status, and the individual experiences of each user.
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