Menstrual Hygiene Matters is a comprehensive resource developed by WaterAid to address the challenges of menstrual hygiene management (MHM) for women and girls in low- and middle-income countries. The guide comprises nine modules and toolkits that cover various aspects of MHM in different settings, such as communities, schools, and emergencies. It brings together global examples of good practices, offers guidance to build competence and confidence in addressing menstrual hygiene, and encourages advocacy to break the silence surrounding menstruation. The resource emphasizes that menstruation, though a natural process, is often surrounded by taboos and socio-cultural restrictions, leading to the neglect of MHM in WASH (Water, Sanitation, and Hygiene) and other sectors. This neglect results in women and girls being denied their rights to health, education, dignity, and gender equity. The guide aims to make the invisible visible by highlighting the importance of integrating MHM into WASH programs and ensuring that women and girls have access to the necessary facilities and information to manage menstruation hygienically and with dignity.