Can you get Genital Herpes from Herpes in your Mouth?
Dear Dr. Tom:
If you have oral sex with someone who is infected with herpes and get herpes in your mouth, when it reoccurs, does it then become genital herpes, or would it just reoccur in your mouth?
Dr. Tom’s Response:
Dear Anonymous:
Oral sex whether by fellatio or cunnilingus brings the virus from the penis or vagina into the mouth of the recipient. Herpetic infection of the genitalia is genital herpes. Recurrent outbreaks are most likely to occur in the mouth and adjacent areas. Self-inoculation to one’s own genitals and eyes has been reported. Also remember that this is a peculiar virus which has not read our textbooks.
The short answer
Many people are surprised to learn that a cold sore can lead to genital herpes. The same virus can live in either place, and oral sex can carry it from one to the other. This is now a common cause of new genital herpes infections.
Key facts
- Yes, it can happen. HSV-1, the usual cause of cold sores, can spread from the mouth to a partner's genitals during oral sex.
- This is why a share of new genital herpes cases are caused by HSV-1.
- HSV-2 can also spread to the mouth through oral sex, although this is less common.
- The NHS advises avoiding oral sex until a cold sore has fully healed. Herpes can also spread when no sore is visible.
When to talk to a doctor
See a doctor or sexual health clinic if you notice genital sores or blisters, especially while they are fresh so they can be swabbed. Ask about treatment and how to protect partners.
Related reading
Sources
- CDC – About Genital Herpes
- Planned Parenthood – Herpes
- NHS – Cold sores
- MedlinePlus (NIH) – Herpes (HSV) Test
This is general information, not medical advice. Please see our medical disclaimer. Section added October 2026.
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