In medicine, a prodrome is an early sign or symptom (or set of signs and symptoms), which often indicate the onset of a disease before more diagnostically specific signs and symptoms develop. It is derived from the Greek word prodromos, meaning “running before”. Prodromes may be non-specific symptoms or, in a few instances, may clearly indicate a particular disease, such as the prodromal migraine aura.

Reference: Wikipedia, https://en.wikipedia.org/wiki/Prodrome , consulted on ,july 6th,2019