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What causes a cold sore?

Cold sores are caused by an infection with a virus called the herpes simplex virus (HSV). There are two different forms of the virus that can cause cold sores, HSV1 and HSV2.

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About this article

Author: Dr Joanne Van der Velden PhD, BSc (Hons)
First answered: 19 Sep 2014
Last reviewed: 19 May 2018
Rating: 4.0 out of 5
Votes: 170 (Click smiley face below to rate)
Category: Genital herpes

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