prodromal

/proʊˈdroʊməl/
adjective
  1. Relating to or being an early symptom or sign that indicates the onset of a disease or condition.
    • Doctors look for prodromal symptoms to diagnose the condition early.
    • During the prodromal stage, the patient may feel unusually tired and irritable.
    • The prodromal phase of the flu often includes a sore throat and body aches.