Abstract

This contribution gives an overview of the few passages of Ancient Greek literature dealing with the causes of epidemics and contagions (i.e. in Hippocrates, Thucydides, Isocrates, ps-Aristotle’s Problems, Plutarch, and Galen). With the help of the distinction between an ontological and a physiological conception of what a disease is, I suggest that the latter was an obstacle to better understand the process through which epidemics spread. I nonetheless show that the ontological conception of these diseases was not entirely absent from Antiquity, as it is shown by Galen, who offers an etiological explanation of the origin of epidemics that combines both conceptions, the ontological and the physiological one.