Our research examines the impact of menstruation on fieldwork experiences in natural science disciplines, with a particular focus on how systemic androcentric biases shape working conditions. We conducted a cross-sectional survey with 429 participants—primarily women—to collect both quantitative and qualitative data on the logistical, social, and health-related challenges faced during fieldwork. Key aspects include the availability of menstrual hygiene products in first aid kits, access to adequate sanitary facilities, and the communication difficulties regarding menstrual issues, especially with male supervisors. By linking these findings to broader social and cultural dynamics, our study highlights the influence of patriarchal norms in structuring academic environments and calls for more inclusive and equitable fieldwork practices. Our interdisciplinary approach bridges natural sciences and gender studies, offering a critical perspective on how to improve working conditions and advance equity in research settings., Starting Grants – Monitoring European Research Council’s Implementation of Excellence, European Research Council; Margarita Salas Grant from Universidad Complutense de Madrid, grant CT31/21; PID2022-138275NB-I00 project (Ministerio de Ciencia e Innovación, Spain); Humboldt Research Fellowship for postdoctoral researchers; Marie S. Curie Postdoctoral Fellowship; Marie Skłodowska-Curie grant agreement No 101064340; InterRest project, funded through the 2020-2021 Biodiversa+ and Water JPI joint call for research projects, under the BiodivRestore ERA-NET Cofund (GA N°101003777); Deutsche Forschungsgemeinschaft, research grant 491739988; Swedish Environmental Protection Agency grant 2022-00027; Spanish Ministry of Science, Innovation and Universities, grant PCI2022-1329, Peer reviewed