What Are Cold Sore Triggers? Topic Guide

What Are Cold Sore Triggers? What Are Cold Sore Triggers?: Cold sores on the lip or mouth are caused by the herpes simplex virus type 1 (HSV-1) or genital herpes, which can be contagious when a person is experiencing symptoms or not. Triggers for cold sores may include stress, recent fever, illness, fatigue, hormonal changes, sunlight, exposure to wind, cold weather, and more.

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