Abstract
This article examines men's prostate cancer experiences through the lens of patient expertise. Qualitative interviews were conducted with 29 men treated for prostate cancer, recruited from two prostate cancer support groups (PCSGs) in the South-East of England. Different forms of expertise, as classified by Collins, were found to be possessed by these men. How these different forms of expertise were acquired, used, and shared with others are explored, and a concept of communal licensing is posited to better understand these activities. The acquisition and usage of these different forms of expertise, through the employment of moral discourses that emphasise responsibility for one's own health, are found to serve to blur the boundaries between lay person and expert.