PRODROME

n. preliminary symptom of illness, early sign of future disease (Medicine)

In medicine, a prodrome is an early symptom indicating the development of a disease, or indicating that a disease attack is imminent. For example fever, malaise, headache and anorexia (lack of desire to eat) are part of the prodrome for the mumps.It also refers to the initial in vivo round of viral replication.Prodromal labour, also called "false labour," is the early signs before labour starts. See Braxton Hicks.
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Prodrome /pro·drome/ a premonitory symptom; a symptom indicating the onset of a disease.prodro´malprodro´mic pro·drome n. pl. [more]Prodrome - Community and Resources

Noun
1. an early symptom that a disease is developing or that an attack is about to occur
(synonym) prodroma
(hypernym) symptom

n. prodrome, preliminary symptom of illness (Medicine)