The quickest way to tell bacterial vaginosis (BV) from a yeast infection is by the discharge and smell. BV produces a thin, grayish discharge with a fishy odor, while a yeast infection causes thick, white, odorless discharge that often looks like cottage cheese. Beyond that one difference, these two conditions feel noticeably different in your body, and they require completely different treatments, so getting the distinction right matters.
Both conditions are extremely common. About 75% of women experience a yeast infection at least once in their lifetime, and the global prevalence of BV is estimated at around 26%. In clinical settings where women come in with vaginal symptoms, BV and yeast infections each account for roughly 20 to 23% of cases. Despite how frequently they occur, many people mix them up or guess wrong, which can mean using the wrong over-the-counter product and delaying effective treatment.
Discharge: The Most Reliable Clue
Discharge is the single most useful symptom for telling these two apart at home, because each condition produces a distinctly different type.
With a yeast infection, discharge is typically thick, white, and clumpy. It’s often compared to cottage cheese or ricotta. You may also notice a white coating in and around the vagina. This discharge has little to no smell.
BV discharge looks and behaves differently. It tends to be thin, uniform, and grayish-white to yellowish. Some women describe it as watery or slightly foamy. The texture is smooth and homogeneous rather than clumpy. And the smell is distinctive: a fishy odor that often becomes more noticeable after your period or after sex.
How Each One Feels
Yeast infections are the itchy one. The hallmark symptom is persistent itching and irritation of the vulva (the external tissue around the vaginal opening). This can range from mildly annoying to severe enough to cause redness, swelling, and even small tears or cracks in the skin. Many women also feel a burning sensation, particularly during urination or intercourse, along with general soreness in the area.
BV, by contrast, often causes surprisingly little physical discomfort. Many women with BV notice the odor and unusual discharge but don’t have significant itching or pain. Some experience mild irritation, but intense vulvar itching and swelling point much more strongly toward a yeast infection. If your primary complaint is smell rather than itch, BV is the more likely culprit.
What’s Actually Happening in Your Body
These two conditions have completely different causes, which is why the same treatment can’t fix both.
A yeast infection is caused by an overgrowth of fungus, most commonly Candida, that naturally lives in the vagina in small amounts. When something throws off the balance (antibiotics, hormonal changes, a weakened immune system), the fungus multiplies and triggers inflammation. Because it’s a fungal problem, it requires an antifungal treatment.
BV happens when the normal balance of bacteria in the vagina shifts. Beneficial bacteria that keep the environment slightly acidic get crowded out by other types of bacteria, particularly a species called Gardnerella. The vaginal pH rises above 4.5 (normal is around 4.0 to 4.5), and this less acidic environment allows those bacteria to thrive further. Because it’s a bacterial overgrowth, BV requires an antibiotic to resolve.
A Quick Side-by-Side
- Discharge texture: Thick and clumpy (yeast) vs. thin and uniform (BV)
- Discharge color: White (yeast) vs. grayish-white or yellowish (BV)
- Odor: Little to none (yeast) vs. fishy, especially after sex or periods (BV)
- Itching: Often intense (yeast) vs. mild or absent (BV)
- Vulvar swelling or redness: Common (yeast) vs. uncommon (BV)
- Burning during urination: Common (yeast) vs. less typical (BV)
- Vaginal pH: Normal, around 4.0 to 4.5 (yeast) vs. elevated above 4.5 (BV)
Why Self-Diagnosis Can Go Wrong
Studies consistently show that people aren’t great at diagnosing themselves. The symptoms can overlap, and other conditions like trichomoniasis (a sexually transmitted infection) can mimic both BV and yeast infections. If you’ve never had either condition before, or if your symptoms don’t clearly match one pattern, getting tested is the most reliable path.
A healthcare provider can confirm the diagnosis in a few ways. For BV, they look for a set of clinical signs: thin grayish discharge, elevated vaginal pH, a fishy smell when a solution is applied to a sample, and the presence of “clue cells” under a microscope (these are vaginal cells so heavily coated in bacteria that their edges appear blurred). For a yeast infection, a microscope sample reveals fungal structures instead. At-home vaginal pH test strips are available and can offer a rough signal. If your pH is above 4.5, BV is more likely. If it’s in the normal range, a yeast infection is the stronger possibility. But pH alone isn’t definitive.
Treatment Is Not Interchangeable
This is the most important practical reason to get the diagnosis right. Using an over-the-counter antifungal cream for what turns out to be BV won’t help, and taking antibiotics for a yeast infection can actually make it worse by killing off more of the good bacteria that keep yeast in check.
Yeast infections are treated with antifungal medications, available as vaginal creams, suppositories, or oral pills. Mild infections often respond to short courses of over-the-counter antifungal products. If you’ve had yeast infections before and recognize the symptoms clearly, self-treating with an OTC antifungal is reasonable.
BV requires a prescription antibiotic, either taken orally or applied vaginally. There’s no effective over-the-counter treatment for BV. If you suspect BV based on the fishy odor and thin discharge, you’ll need to see a provider to get the right medication. BV also has a higher tendency to recur. Roughly half of women treated for BV experience it again within 12 months.
Why BV Shouldn’t Be Ignored
A yeast infection is uncomfortable but generally not dangerous if left untreated for a short time. It won’t resolve on its own, but it’s unlikely to cause serious complications. BV carries more risk. Untreated BV can increase susceptibility to sexually transmitted infections, contribute to pelvic inflammatory disease, and cause complications during pregnancy, including preterm delivery. The fishy odor might feel like the most bothersome symptom, but the bacterial imbalance behind it is worth addressing promptly.
If you’re pregnant or trying to become pregnant and notice symptoms that could be BV, getting tested sooner rather than later is especially worthwhile. The same applies if you have a new sexual partner or if symptoms keep coming back despite treatment.