This chapter brings discussions of gender injustice in medicine to the forefront of philosophy of medicine. It highlights how gender impacts the kind and quality of healthcare that patients receive and underscores how gendered experiences in medicine are further mediated by other features of identity such as race, sexual orientation, body size, and disability status. To that end, it argues that gender and gendered phenomena are critical areas of inquiry for philosophy of medicine that cannot be ignored in analyses of medical practice and healthcare outcomes. In particular, the chapter illustrates how gendered phenomena such as the (presumed) binary system of sex, epistemic injustice, medical gaslighting, and microaggressions shape both clinical encounters and health outcomes for cisgender women, trans and non-binary people, and intersex people. Understanding how these phenomena influence medical experiences and outcomes of patients with nondominant genders is a key aspect of moving toward health justice and health equity.