Public communication on health issues on the Internet is not only a matter of popularization of medical information. It deeply deals with narration, conversation and dialogue, which are typical values in the Web 2.0. This interview will emphasize that blogs, forums, wiki are new ways in which population has been reconstructing and integrating medical knowledge. These ways are re-defining medical knowledge by means of unhinging the standard medical communication practices, based on a linear diffusion of knowledge form experts to laypeople.