It aims to raise the awareness about the importance of good menstrual hygiene management.
It was initiated by the German-based NGO WASH United in 2013.
May is the fifth month of the year, representing the average length of a menstrual cycle (five days), and 28 signifies the average number of days in a menstrual cycle.
The theme for 2025 is “Together for a #PeriodFriendlyWorld”.