This paper introduces the idea of testimonial compression, which I introduce as the audience enforcement of how testifiers may engage in testimonial exchange. More specifically, testimonial compression occurs when an audience requires the speaker to engage in the limited format of simple testimony. Using examples of dialogue from healthcare settings and scholarship on health communication, I illustrate the concept further. Dimensions of testimonial compression include its directness, the roles of audience enforcement and testifier resistance, the fuzziness surrounding structural and agential aspects, and ways in which compression can be negotiated between interlocutors. I further detail some rippling effects of testimonial compression, including impacts of patient-provider communication and the potential for epistemic harms (specifically informational and participatory prejudices). While testimonial compression is not unique to healthcare contexts, many contextual factors specific to medical discourse make testimonial compression especially useful.