The most telling signs of bacterial vaginosis (BV) are a fishy vaginal odor and thin, grayish discharge. Unlike a yeast infection, BV usually doesn’t cause significant itching or pain, which is why many people aren’t sure what they’re dealing with. About half of people with BV don’t notice symptoms at all, but when symptoms are present, they follow a fairly recognizable pattern.
What BV Discharge Looks and Smells Like
BV discharge is thin and watery, sometimes described as having a milklike consistency. It coats the vaginal walls smoothly rather than clumping. The color is typically gray or white, though it can sometimes appear greenish. The volume tends to be heavier than your normal discharge.
The smell is the hallmark. It’s often described as “fishy” and tends to get stronger after sex and during your period. You might notice it most when showering or using the bathroom. If your discharge is thick, white, and clumpy with no strong odor, that’s more likely a yeast infection than BV.
BV vs. Yeast Infection
These two get confused constantly, but they feel quite different. BV can cause mild irritation, but it typically doesn’t cause pain. Yeast infections, on the other hand, come with intense itching, burning, and sometimes pain during sex. The discharge is the easiest way to tell them apart: BV produces thin, grayish, fishy-smelling discharge, while yeast infections produce thick, cottage cheese-like discharge that usually has little to no odor.
This distinction matters because the treatments are completely different. Yeast infection remedies won’t clear BV, and vice versa. If you’re not sure which one you have, getting tested rather than guessing saves time and frustration.
What’s Actually Happening Inside Your Body
Your vagina naturally contains bacteria, mostly a type called Lactobacillus that keeps things acidic (a healthy pH falls between 3.8 and 4.5). This acidity prevents harmful bacteria from taking over. BV happens when Lactobacillus levels drop sharply and other bacteria multiply to fill the gap. Your vaginal pH rises above 4.5, becoming less acidic, and the environment shifts in a way that produces those recognizable symptoms.
Interestingly, while low bacterial diversity in the gut is linked to disease, the opposite is true in the vagina. A healthy vagina is dominated by just a few bacterial species. When the diversity increases, that’s actually a sign of imbalance.
What Raises Your Risk
Several things can disrupt the bacterial balance that keeps BV at bay:
- Douching washes away the protective bacteria and is one of the strongest risk factors.
- New or multiple sexual partners introduce different bacteria that can shift the vaginal environment.
- Not using condoms allows more direct bacterial exchange during sex.
BV can develop without any sexual activity, but it rarely affects people who have never had sex. You can’t get BV from toilet seats, swimming pools, or bedding.
Can You Test for BV at Home?
Over-the-counter vaginal pH test kits are available for around $30 or less and can tell you whether your pH is elevated. A result above 4.5 suggests something is off. But a high pH alone doesn’t confirm BV specifically. Trichomoniasis (a sexually transmitted infection) and other conditions also raise vaginal pH. These kits are also unreliable if you’re in perimenopause or menopause, since pH naturally shifts higher during those stages, or right before your period.
Think of a home pH test as a screening tool, not a diagnosis. If the result comes back elevated and you have the typical symptoms (thin discharge, fishy smell, no significant itching), BV is likely. But confirming it and getting effective treatment requires a clinical visit, where a provider can examine the discharge under a microscope and run more specific tests.
How BV Is Treated
BV is treated with prescription antibiotics, available as either oral pills or a vaginal gel or cream. Treatment typically lasts about five to seven days. Most people notice the odor and discharge improving within a few days of starting.
The frustrating reality is that BV has a high recurrence rate. Between 50% and 80% of people who complete antibiotic treatment experience BV again within 6 to 12 months. Recurrence doesn’t mean you did anything wrong. The underlying bacterial balance can be difficult to restore permanently, and researchers still don’t fully understand why some people are more prone to repeat episodes.
Why It’s Worth Getting Checked
BV isn’t just uncomfortable. It increases susceptibility to sexually transmitted infections, including HIV. During pregnancy, BV has been linked to a higher chance of preterm delivery (before 37 weeks), which carries serious risks for the baby including breathing problems and other complications. The exact relationship between BV and preterm birth is still being studied, but the association is well-documented enough that symptoms during pregnancy deserve prompt attention.
Left untreated, BV sometimes resolves on its own, but it often doesn’t, and lingering infections can make you more vulnerable to other reproductive health issues. If you’re noticing a persistent fishy smell, unusual discharge, or both, those are strong enough signals to get tested rather than wait it out.