Of or pertaining to prodromes; as, the prodromal stage of a disease.

Subtle symptoms or changes that may occur prior to the onset of the full symptom spectrum of a disorder.

symptomatic of the onset of an attack or a disease

Derived from the Greek word prodromos meaning the forerunner of an event. In medicine it refers to the early signs of a illness that precede a fully developed illness.

early period or sign of a disease.