prodromic

/proʊˈdroʊmɪk/
adjective
  1. Relating to or being an early symptom or sign that indicates the onset of a disease or condition.
    • Prodromic symptoms can help doctors predict the severity of the disease.
    • The prodromic stage of the illness is often mistaken for a common cold.
    • She experienced prodromic fatigue days before the rash appeared.