noun
prodrome; premonitory symptom
Medical term for early symptoms that appear before the main phase of an illness.
インフルエンザの前駆症状として、倦怠感や頭痛が現れることがある。
Fatigue and headache can appear as prodromal symptoms of influenza.
初期症状 refers to early-stage symptoms in general, while 前駆症状 specifically denotes symptoms that precede the main illness phase.
Compound of 前駆 (forerunner) and 症状 (symptom), a direct translation of the medical term 'prodrome'.