Bacterial vaginosis (BV) and yeast infections are both common vaginal conditions, but they have different causes, different symptoms, and require different treatments. BV is caused by an overgrowth of bacteria, while a yeast infection is caused by an overgrowth of fungus. Telling them apart matters because using the wrong treatment won’t help and can make things worse.
What Causes Each Condition
Your vagina naturally contains a balance of bacteria and yeast. Both BV and yeast infections happen when that balance tips in the wrong direction, but the organisms involved are completely different.
BV develops when the protective bacteria in your vagina (called lactobacilli) get displaced by a mix of other bacterial species. It’s not a single-germ infection. Instead, it’s a shift in the entire ecosystem, with dozens of different bacterial types multiplying at once. The process typically starts with certain aggressive bacteria attaching to vaginal cells and crowding out the healthy ones, followed by a second wave of other species taking hold. This bacterial shift raises your vaginal pH above 4.5, making the environment less acidic than normal.
A yeast infection, on the other hand, is caused by Candida, a type of fungus that normally lives in small amounts in your vagina and digestive tract. When conditions change, Candida can multiply rapidly and cause symptoms. Unlike BV, a yeast infection doesn’t change your vaginal pH. It typically stays in the normal range of 4.0 to 4.5.
How Symptoms Compare
The most reliable way to tell BV and yeast infections apart at home is by paying attention to three things: discharge, odor, and itching.
- BV discharge is thin, grayish, and sometimes foamy. It often comes with a strong fishy smell, especially after sex.
- Yeast infection discharge is thick, white, and usually odorless. It’s often described as having a cottage cheese-like texture, and you may notice a white coating in and around your vagina.
Itching is another major difference. Yeast infections usually cause noticeable itching and redness of the vagina and vulva. BV rarely causes significant itching. In fact, many people with BV have no symptoms at all and only discover it during a routine exam.
Pain during urination or sex can occur with either condition, so that alone won’t help you distinguish between them.
Risk Factors for Each
BV and yeast infections share some triggers but also have distinct ones. BV is more closely linked to things that disrupt your vaginal bacteria: douching, new or multiple sexual partners, and using scented products in or around the vagina. BV is the most common vaginal condition in women ages 15 to 44.
Yeast infections are more likely to flare up after taking antibiotics (which kill off protective bacteria and give Candida room to grow), during pregnancy, with uncontrolled blood sugar, or when your immune system is suppressed. Hormonal changes, like those around your period or from birth control, can also play a role.
There’s an important overlap between the two conditions. Treating BV with antibiotics can itself trigger a yeast infection. Repeated antibiotic exposure from recurrent BV can even lead to drug-resistant yeast strains, making future yeast infections harder to treat.
How Each Is Diagnosed
Because symptoms can overlap or be subtle, a clinical exam is the most reliable way to confirm which condition you have. For BV, providers look for a combination of signs: thin grayish discharge, a vaginal pH above 4.5, a fishy odor when a chemical solution is applied to a sample, and the presence of certain cells (called “clue cells”) under a microscope. Meeting at least three of these four criteria confirms the diagnosis.
Yeast infections are diagnosed differently, usually by examining a vaginal sample under a microscope to look for yeast cells or fungal structures. Since yeast infections don’t raise vaginal pH, a normal pH reading alongside itching and thick white discharge points strongly toward yeast rather than BV.
Home pH test kits can be a helpful first step. If your pH is above 4.5, BV or another infection is more likely. If it’s in the normal range and you have itching and thick discharge, a yeast infection is the more probable cause. But these kits can’t give you a definitive diagnosis on their own.
Treatment Differences
This is where getting the right diagnosis really matters. BV and yeast infections require completely different medications, and using the wrong one won’t clear the infection.
BV is treated with antibiotics, either taken by mouth or applied as a vaginal gel or cream. A typical course lasts five to seven days, though single-dose options exist. These antibiotics target the overgrown bacteria and help your vaginal environment return to normal.
Yeast infections are treated with antifungal medications. Mild cases often respond to over-the-counter vaginal creams or suppositories available at any pharmacy, or a single-dose oral antifungal pill prescribed by your provider. Treatment length ranges from one to seven days depending on the severity.
One important note: if you’ve been treating what you think is a yeast infection with OTC products and it’s not improving after a few days, there’s a reasonable chance it’s actually BV (or something else entirely). OTC antifungals do nothing for BV.
Why Recurrence Is So Common
Both conditions have frustratingly high recurrence rates. Up to half of people treated for BV experience a recurrence within a year. The bacterial communities involved in BV can form protective structures on vaginal tissue that make them difficult to fully eliminate with antibiotics.
Yeast infections also come back frequently, especially if the underlying trigger persists. Repeated BV treatments with antibiotics create a cycle: the antibiotics clear the bacteria but leave the door open for yeast, and treating the yeast can sometimes shift conditions back toward BV.
Prevention Strategies
Many of the same habits help prevent both conditions by keeping your vaginal environment stable. Avoid douching entirely, as it washes away protective bacteria and disrupts your natural balance. Wear cotton or cotton-crotch underwear, which breathes better and keeps moisture from building up. Change out of wet swimsuits and sweaty workout clothes promptly.
Skip scented tampons, pads, vaginal deodorants, perfumed soaps, and bubble baths. Rinse your vulva with mild soap and water, and dry thoroughly. Change tampons and pads every four to eight hours, and clean menstrual cups and sex toys carefully according to their instructions.
For yeast infections specifically, managing blood sugar (if you have diabetes) and discussing alternatives with your provider when antibiotics trigger repeated yeast flares can make a significant difference. For BV specifically, limiting exposure to new sexual partners and using condoms may reduce recurrence, though BV is not classified as a sexually transmitted infection.