Social science research into the social patterning of health and illne
ss is extensive. One important aspect of this has been work on lay kno
wledge about health and illness. In this paper we develop three main a
rguments. First, we suggest that recent developments in social science
understanding of the nature and significance of lay knowledge should
be more widely recognized within the social sciences themselves. Secon
d, we argue that if public health research, whatever the disciplinary
perspective, is to provide an understanding of contemporary health pro
blems that is simultaneously more robust and more holistic, it must in
corporate and develop the theoretical and conceptual insights offered
by this recent work on lay knowledge and with lay people. Finally, we
argue that in order to accomplish this it will be necessary to constru
ct research questions in such a way that the conventional distinctions
between science and non-science, and the methodological wrangles asso
ciated with this distinction, become marginal to the research process.
This will inevitably involve conflicts between members of different p
rofessional groups. These conflicts provide the opportunity for open d
ebate on the science and politics of public health research and repres
ent a challenge for the many disciplines involved in this field.