A vaginal yeast infection is not considered contagious in the traditional sense, but it can be passed to a sexual partner. The key distinction: most yeast infections develop from an overgrowth of fungus already living in your body, not from catching it from someone else. Still, sexual contact can transfer yeast between partners, which is why the answer isn’t a simple no.
Why Yeast Infections Aren’t Classified as STIs
The fungus responsible for yeast infections, Candida, already lives on everyone’s skin and inside the body, including the mouth, gut, and vagina. It only causes problems when something disrupts the normal balance and allows it to multiply out of control. That’s why people who have never had sex still get yeast infections. The infection is typically an internal event, not something introduced from the outside.
This is the reason health agencies like the CDC do not classify vaginal yeast infections as sexually transmitted infections. The overwhelming majority of cases start from within your own body, triggered by factors like antibiotics, hormonal changes, a weakened immune system, or elevated blood sugar.
How It Can Pass Between Partners
Even though most yeast infections aren’t sexually acquired, transmission during sex is possible. Yeast can transfer between partners during vaginal, oral, or anal sex. There is also evidence linking oral-genital contact to vaginal yeast infections, meaning Candida in the mouth can potentially be introduced to the genital area and vice versa.
Condoms and dental dams reduce this risk. If you’re in the middle of an active infection, barrier protection is worth considering to avoid passing yeast to your partner.
Risk to Male Partners
If your partner has a penis, the risk of developing symptoms after unprotected sex with someone who has a yeast infection is relatively low. About 15% of men develop an itchy rash on the penis after exposure. When symptoms do appear, the condition is called balanitis, an inflammation of the head of the penis. Signs include:
- Moist, shiny skin on the head of the penis
- A thick white substance collecting in skin folds
- Itching, burning, or irritation
- Changes in skin color in the affected area
Men who develop these symptoms benefit from over-the-counter topical antifungal creams applied to the affected area. The symptoms typically clear within a few days of treatment.
Does Your Partner Need Treatment?
Current CDC guidelines are clear on this point: routine treatment of sexual partners is not recommended for vaginal yeast infections. This applies to both uncomplicated and recurrent cases. There is no evidence that treating an asymptomatic partner helps resolve the infection or prevents it from coming back.
The exception is when a partner actually develops symptoms. A male partner with balanitis, for example, should treat that irritation with a topical antifungal. But treating a partner “just in case” isn’t supported by the data and isn’t something most clinicians will suggest.
This is a meaningful difference from bacterial STIs, where partner treatment is standard practice to prevent reinfection. With yeast infections, the source is almost always your own body’s microbiome, so treating your partner won’t change the underlying conditions that caused the overgrowth in the first place.
Sex During a Yeast Infection
Having sex while you have a yeast infection won’t cause serious harm, but it can make your symptoms worse. Irritated vaginal tissue is more sensitive, and friction during intercourse can increase discomfort, itching, and inflammation. If sex is making things feel worse, it’s worth waiting until symptoms clear.
One practical concern: many antifungal creams and suppositories used to treat yeast infections can weaken latex condoms and diaphragms. If you’re using a cream-based treatment and relying on latex barriers for contraception or STI prevention, the barrier may not work as intended. Non-latex options or simply waiting until treatment is finished are both reasonable approaches.
Reducing the Chance of Passing It Along
Because transmission is possible even if it isn’t the primary way yeast infections develop, a few practical steps can minimize the risk. Using condoms or dental dams during vaginal, oral, or anal sex while you have an active infection is the most straightforward option. Waiting until your symptoms have fully resolved before having unprotected sex is another. If you notice your partner developing genital irritation or redness after sexual contact, an over-the-counter antifungal cream can address it quickly.
For people dealing with recurrent yeast infections (four or more per year), the focus should be on identifying what’s triggering the overgrowth rather than worrying about sexual transmission. Common culprits include frequent antibiotic use, uncontrolled diabetes, hormonal contraceptives, and immune suppression. Addressing those root causes is far more effective than treating a partner who likely isn’t the source of the problem.