The main concern of this study is an attemptto examine medicai practice and knowledge from their "innards", contrasting with usual criticai analyses that are often made from an externai standpoint, not mattering wether the approach is that of social sciences or economics. With this guideline as a starting point, it becomes evident that the supposed scientificity of medicine doesn't hold when one analyses its theore-tical framework, specially into what epidemiology, a core discipline to the construction of objects for the clinicai practice, is concerned. Moreover, cate-gories that are basic to clinicai reasoning remain undefined, as if they were natural objects, already existant, and this allows for the main reason for the search for medicai care, suffering, to be put aside from medicai thinking, and the patient to become faded away so that disease can arise therefrom. Finally, with regard to the eminently individualized character of medicai practice, which in itself departs from the natural sciences' paradigm, the adoption of a scientific atitude is advocated, so that doctors can exert a certain criticism on the basis of their practice and recover the role of suffering as the main axis of medicai thinking.