Athenaeus of Attaleia (fl. mid-first century BC) offers a fascinating example of the interest among Graeco-Roman physicians in marking out the boundaries between medicine and philosophy. As founder of the so-called Pneumatist medical sect, he was deeply influenced by contemporary Stoicism. A number of surviving ancient testimonia tell us that he held a distinctive view on the question of how far medicine should analyse the composition of the human body. Rather than having recourse to the Stoic cosmic elements fire, air, (...) earth and water, he maintained that in the context of the medical art, the relevant elements were the elemental qualities hot, cold, wet and dry. This paper is an attempt to pin down Athenaeus’ position on these issues, and his motivations for holding it, despite a number of conflicting and problematic claims in the surviving evidence. (shrink)