Since 2015, menstruation has become increasingly politicised on social media. This impetus has been driven by activists who strive to destigmatise menstruation and raise awareness of issues such as "period poverty." As sociological studies demonstrate, menstrual stigma is rooted in ideologies that construct menstruating women as leaking, unhygienic and irrational. Such discourses are indicative of a societal imperative to ensure that menstrual blood remains concealed. By creating memes, social media users are increasing the visibility of menstruation in the public space. Drawing on concepts from critical menstruation studies and theories about humour and ideology, this article explores the discourses that inform menstrual memes. Using Nvivo, 220 memes posted on Instagram with the hashtag "#periodmemes" were coded and then analysed with MCDA. Although many of these memes perpetuate stigma, a significant number use humour to problematise harmful ideologies. This article argues that, despite appearing trivial, menstrual memes have the potential to normalise menstruation and advance the objectives of menstrual activism.