1 doctor weighed in:

Could oral sex cause canker sores?

1 doctor weighed in

In brief: Depends

A true canker sore is an auto-immune condition that is not contagious.
It can occur as a result of different types of stress. However, a herpetic ulcer can be mistaken to be a canker sore. Herpetic ulcers are contagious and can be transmitted by oral sex.

In brief: Depends

A true canker sore is an auto-immune condition that is not contagious.
It can occur as a result of different types of stress. However, a herpetic ulcer can be mistaken to be a canker sore. Herpetic ulcers are contagious and can be transmitted by oral sex.
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