The fastest way to tell a yeast infection from bacterial vaginosis (BV) is by the discharge. A yeast infection produces thick, white, cottage cheese-like discharge that typically doesn’t smell. BV produces thin, grayish discharge that’s heavier in volume and carries a noticeable fishy odor, especially after sex or your period. Both cause irritation, but they’re fundamentally different problems that require different treatments, so getting the distinction right matters.
How Discharge and Odor Differ
Discharge is the single most useful clue you have at home. With a yeast infection, you’ll notice clumpy, white discharge that sticks to the vaginal walls. It can look like cottage cheese or wet paper. The smell is usually mild or absent entirely.
BV discharge looks and behaves differently. It’s thin and watery, often grayish-white, and coats surfaces more smoothly. The hallmark is a fishy odor that gets stronger after intercourse or during your period. If you notice a strong smell, that points strongly toward BV. If you don’t, yeast is more likely.
How Each One Feels
Yeast infections are dominated by itching. The vulva and vaginal opening can feel intensely itchy, swollen, and sometimes burning, particularly during urination or sex. The skin around the vaginal opening may look red and irritated.
BV, on the other hand, often causes less obvious physical discomfort. Many people with BV notice the odor and discharge but don’t have significant itching or swelling. Some feel mild irritation or burning, but the sensation is generally less intense than with a yeast infection. About half of people with BV have no symptoms at all, which is one reason it often goes undiagnosed.
What Causes Each Condition
Despite similar territory, these two infections have completely different origins. A yeast infection is caused by an overgrowth of fungus, most commonly Candida. Your vagina normally contains small amounts of yeast, but certain triggers let it multiply out of control. The biggest risk factors are antibiotic use (which kills off protective bacteria and gives yeast room to grow), hormonal changes from pregnancy or birth control pills containing estrogen, uncontrolled diabetes, and a weakened immune system.
BV happens when the balance of bacteria in the vagina shifts. Normally, beneficial bacteria keep less helpful anaerobic bacteria in check. When that balance tips, the anaerobic bacteria overgrow. Douching is one of the most common triggers because it disrupts the vaginal environment. New or multiple sexual partners also increase BV risk, though BV isn’t classified as a sexually transmitted infection. Ironically, douching can also trigger yeast infections for the same reason: it destabilizes the vaginal ecosystem.
Why Getting the Right Diagnosis Matters
These two conditions require opposite treatments. Yeast infections are treated with antifungal medications, while BV requires antibiotics. Using the wrong treatment won’t help and can make things worse. Taking antibiotics for a suspected BV infection when you actually have yeast, for instance, can kill off more protective bacteria and worsen a yeast overgrowth.
For uncomplicated yeast infections, over-the-counter antifungal creams and suppositories work well, with treatment courses ranging from a single application to 7 or 14 days depending on the product. A single-dose prescription oral antifungal is another common option. If you’re pregnant, only topical treatments applied for 7 days are recommended, as the oral antifungal has been linked to complications including spontaneous abortion.
BV always requires a prescription. There’s no effective over-the-counter treatment for it. If you suspect BV based on the discharge and odor pattern, you’ll need to see a provider.
Can You Test at Home?
Over-the-counter vaginal pH test kits are available, and they can offer one piece of the puzzle. A healthy vaginal pH sits between 3.8 and 4.5. BV raises pH above 4.5, so an elevated reading is consistent with BV. Yeast infections typically don’t change vaginal pH, so a normal reading paired with symptoms could suggest yeast.
But pH tests have real limitations. The FDA notes that while home pH tests show good agreement with a doctor’s diagnosis overall, an elevated pH doesn’t confirm BV specifically. Other infections, irritants, and even semen can raise vaginal pH. And a normal pH doesn’t rule out infection entirely. A negative result could still mean you have a yeast infection. Doctors use a combination of pH testing, microscopic examination of discharge, odor assessment, and sometimes cultures to make a definitive diagnosis. A pH strip at home gives you a starting point, not a final answer.
Recurrent Infections
Both conditions have a frustrating tendency to come back. If you get four or more yeast infections in a year, that’s classified as recurrent. Treatment for recurrent yeast infections is more aggressive: an initial course of 7 to 14 days of topical treatment or multiple oral doses, followed by a weekly oral dose for six months as maintenance.
BV recurrence is even more common. It frequently returns within months of treatment, sometimes because the underlying bacterial imbalance was never fully corrected. If your symptoms keep returning, a provider can help identify patterns in your triggers and adjust treatment accordingly.
Risks of Leaving BV Untreated
Yeast infections are uncomfortable but rarely dangerous. BV carries more serious health risks if left untreated. It increases your susceptibility to STIs including HIV, chlamydia, and gonorrhea. Those infections in turn can lead to pelvic inflammatory disease, which can affect fertility.
The stakes are highest during pregnancy. BV during pregnancy raises the risk of preterm birth and low birth weight (under 5.5 pounds). BV sometimes resolves on its own, but treatment is recommended specifically to reduce these risks.
A Quick Comparison
- Discharge: Yeast produces thick, white, clumpy discharge. BV produces thin, grayish, watery discharge.
- Odor: Yeast has little to no odor. BV has a fishy smell, worse after sex.
- Itching: Yeast causes significant itching and swelling. BV causes mild irritation or none.
- pH: Yeast leaves vaginal pH normal. BV raises pH above 4.5.
- Treatment: Yeast is treated with antifungals (available OTC). BV requires prescription antibiotics.
- Common triggers: Yeast is often triggered by antibiotics or hormonal changes. BV is often triggered by douching or new sexual partners.
If your symptoms don’t clearly match one pattern, or if you’ve treated yourself for a yeast infection and it isn’t improving, the most reliable next step is a clinical exam. About two-thirds of people who self-diagnose a yeast infection turn out to be wrong, often because BV mimics some of the same symptoms. A simple office visit can distinguish between the two in minutes.