A yeast infection and bacterial vaginosis (BV) are not the same condition. They share some overlapping symptoms, which is why they’re easy to confuse, but they have different causes, feel different, look different, and require completely different treatments. Using the wrong treatment can delay relief or make things worse, so knowing which one you’re dealing with matters.
What Causes Each Infection
Both conditions involve an imbalance in the vaginal microbiome, but the imbalance goes in opposite directions.
A healthy vagina contains a large population of beneficial bacteria called lactobacilli. These bacteria keep the environment acidic (below pH 4.5), which prevents other organisms from overgrowing. In BV, lactobacilli numbers drop sharply, and a mix of other bacteria fills the gap. The vaginal pH rises above 4.5, creating an environment where these bacteria thrive and form a stubborn biofilm. BV is not caused by a single germ. It’s a shift in the entire bacterial community.
A yeast infection works differently. It’s caused by a fungus, most commonly Candida albicans, that normally lives in small amounts in the vagina. When something disrupts the balance, such as antibiotics, hormonal changes, or a weakened immune system, the fungus multiplies. The pH of the vagina often stays in the normal range during a yeast infection, which is one way doctors can tell the two apart.
How the Symptoms Differ
Discharge is the most reliable clue for telling these two infections apart at home.
With a yeast infection, discharge is typically thick, white, and odorless. Many people describe it as looking like cottage cheese. The hallmark symptom is intense itching and irritation of the vulva and vaginal opening, often with redness and swelling. Some people also feel burning during urination or sex.
BV discharge looks and behaves differently. It tends to be thin, grayish, and foamy, with a distinctly fishy smell. That odor often gets stronger after sex. Itching is less common with BV than with yeast infections, though some people experience mild irritation. Many people with BV notice the smell before anything else.
Here’s the tricky part: roughly half of people with BV have no noticeable symptoms at all. Yeast infections almost always produce symptoms, particularly itching.
How Common Each One Is
Both are extremely common, but they show up in different patterns. About 75% of women experience at least one yeast infection during their lifetime. BV has a global prevalence estimated at around 26% at any given time, making it the most common vaginal condition among women of reproductive age. In clinical studies of women seeking care for vaginal symptoms, BV and yeast infections occur at roughly equal rates, each accounting for about 22% of cases.
Different Risk Factors
The triggers for each condition overlap somewhat but have important differences.
BV is strongly linked to sexual activity. Having new or multiple sex partners, not using condoms, and douching all increase your risk. It rarely affects people who have never had sex. That said, BV is not formally classified as a sexually transmitted infection, though recent research is challenging that view.
Yeast infections are more closely tied to internal body changes. Antibiotic use is a major trigger because antibiotics kill off protective lactobacilli along with whatever infection they’re treating. Hormonal shifts from pregnancy, birth control, or hormone therapy also raise your risk, as do conditions that affect the immune system, like diabetes or HIV.
Douching increases the risk of both conditions because it disrupts the vaginal microbiome indiscriminately.
Why the Right Diagnosis Matters
These two conditions require completely different medications, and using the wrong one won’t help.
Yeast infections are treated with antifungal medication. Over-the-counter antifungal creams are widely available, and a single oral dose of fluconazole is another common option. For stubborn or recurring infections, doctors may prescribe longer courses or alternative antifungal agents.
BV requires antibiotics, which are only available by prescription. Antifungal creams will do nothing for BV. And here’s an ironic twist: the antibiotics used to treat BV can themselves trigger a yeast infection by wiping out protective bacteria, which is one reason some people feel like they’re bouncing between the two conditions.
Testing before treatment is recommended for both conditions, even though yeast infection treatments are sold over the counter. Studies show that self-diagnosis is wrong roughly half the time. What feels like a yeast infection may actually be BV, or vice versa.
Can You Have Both at Once?
Yes, though true “mixed vaginitis,” where both infections are actively causing symptoms simultaneously, is considered rare. What’s more common is coinfection, where both organisms are present but only one is responsible for your symptoms. If you have BV and also test positive for Candida, that doesn’t necessarily mean you need antifungal treatment on top of antibiotics.
Certain signs suggest a genuine mixed infection: if you have the fishy-smelling discharge typical of BV but also notice significant itching, vulvar inflammation, or clumpy discharge, both infections may be active. People with diabetes are at higher risk for developing a secondary yeast infection after BV treatment.
Recurrence and Partner Treatment
BV is notorious for coming back. Even with proper treatment, recurrence rates are high. A 2024 clinical trial from Australia found that 63% of women whose male partners went untreated had BV return, compared with 35% of women whose partners also received antibiotics. The trial was stopped early because the benefit of partner treatment was so clear. These findings suggest that reinfection from male sexual partners plays a significant role in BV recurrence, and some researchers now argue BV should be reclassified as sexually transmitted.
Yeast infections can also recur, particularly in people with ongoing risk factors like uncontrolled blood sugar or frequent antibiotic use. But partner treatment is generally not part of yeast infection management, since Candida overgrowth is driven more by your own body’s environment than by sexual transmission.
Quick Comparison
- Cause: BV is bacterial; yeast infections are fungal.
- Discharge: BV produces thin, grayish, fishy-smelling discharge. Yeast infections produce thick, white, odorless discharge.
- Main symptom: BV is defined by odor; yeast infections are defined by itching.
- Vaginal pH: BV raises pH above 4.5. Yeast infections typically do not.
- Treatment: BV requires prescription antibiotics. Yeast infections are treated with antifungals, some available over the counter.
- Sexual activity link: BV is strongly associated with sexual activity and new partners. Yeast infections are more tied to antibiotics, hormones, and immune changes.