There are few studies on medical pluralism among the Aymaras of Chile. This article presents and analyzes field material of an ethnography on the articulation of medical knowledge made between the years 2011-2012 with farmers from Camina (Tarapaca-Chile), focusing on the dyad of Andean and Pentecostal Medical Knowledge. The analysis problematizes the theoretical difficulty of conceiving the operativeness resulting from the articulation of medical knowledge, develops the usefulness that the concept of hegemonic symbol (Ernesto De Martino) may have in overcoming this aporia and explores the hypothesis that the devil could be seen as the hegemonic symbol for the case studied, illuminating its role within the generation of hegemonic/subalternate relationships between Andean and Pentecostal medical knowledge.