Endometriosis Awareness Month (EAM) is a global movement that seeks to increase awareness of endometriosis. There is a paucity of peer-reviewed research that explores the social media activity of EAM, making it difficult to draw conclusions about what information is being shared. To address this gap, we performed inductive thematic analysis to investigate the visual and written content of images (n = 879 images), as well as post captions of N = 600 posts. that contained the hashtag “#endometriosisawarenessmonth”. Results show that written content within the images most frequently contained features of the disease. Caption content featured general/vague knowledge about the disease and general awareness of endometriosis, such as ‘pain (general/unspecified)’. The mental health impact of the disease was underrepresented in Instagram posts. Moving forward, the #endometriosisawarenessmonth campaign could be strengthened by communicating specific diagnostic and prevalence information, and harnessing conversations about the impact of the disease on mental health.