There is now documented evidence that adverse events associated with medical interventions have a seriously deleterious affect on population health. But this literature does not indicate whether or not the net affect of an increase in the doctor supply is positive or negative. There are also other mechanisms by which an increase in the doctor supply could reduce the quality and length of life. In this paper Professor Jeff Richardson and Dr Stuart Peacock revisit two hypotheses concerning doctor induced ill health. Econometric results using Australian cross-sectional data are presented. They are consistent with the hypothesis that an increase in the doctor supply is associated with an increase in mortality.