This chapter will contextualise the phenomenon of ‘gaslighting’ as an extension of practices of delegitimising women’s testimonies. It will consider how gaslighting functions to challenge women’s epistemic authority, minimising their expressions of painpain and constructing women’s symptoms as ‘all in their heads’. It will consider how gaslighting can become internalised in, and the particular danger of medical gaslighting in creating conditions in which women begin to doubt their own bodies.