The doctor was surprised; or, how to diagnose a miracle.

A survey of more than six hundred miracle records in the canonization files of the Vatican Secret Archives from the seventeenth century to the twentieth century reveals that more than 95 percent are healings from illness. The history of the canonization process is summarized to explain the sources. The diagnoses amenable to miracle cure change through time to reflect current medical preoccupations and methods. Physician testimony has always been crucial to the investigation of miracles for declaring the hopeless prognosis and the surprise at recovery. From this analysis, medicine and religion emerge as parallel semiotic endeavors, using their canons of wisdom and careful observation to derive meaning in suffering.