Thrush is not classed as a sexually transmitted infection (STI), but it can be triggered by sex. Thrush is caused by a fungus called candida that is normally harmless.

Can a man give you oral thrush?

Oral sex can trigger a yeast infection in your mouth, vagina, penis, or anus. Although it’s possible that you contracted the infection from a partner, the timing may also be a coincidence. No matter the cause, yeast infections usually aren’t serious and can often be treated at home.

What are the signs of an STD in your mouth?

• Sores in the mouth, which may be painless.
• Lesions similar to cold sores and fever blisters around the mouth.
• Sore throat and difficulty swallowing.
• Redness with white spots resembling strep throat.
• Swollen tonsils and/or lymph nodes.