Bacterial vaginosis (BV) doesn’t dramatically change the way the vagina or vulva looks from the outside. Unlike yeast infections or some STIs, BV rarely causes visible redness, swelling, or sores. The most noticeable visual sign is a change in vaginal discharge, which is often the first thing that prompts someone to look more closely or search for answers.
What the Discharge Looks Like
The hallmark of BV is a thin, watery discharge that’s typically grayish-white, though it can sometimes appear white or slightly green. It tends to coat the vaginal walls evenly rather than clumping together. The volume is often heavier than usual, enough that you might notice it on underwear throughout the day.
This discharge looks distinctly different from what’s normal for most people. Healthy vaginal discharge varies across the menstrual cycle but is generally clear to slightly white and may be sticky or stretchy. BV discharge, by contrast, has a smooth, almost milky-water consistency. It doesn’t form chunks or thick patches.
BV Discharge vs. Yeast Infection Discharge
If you’re trying to figure out which infection you’re dealing with based on what you see, the texture of the discharge is the biggest clue. BV produces thin, runny, grayish discharge. A yeast infection produces thick, white, lumpy discharge often described as looking like cottage cheese. The two are quite easy to tell apart visually once you know what to look for.
Yeast infections also tend to cause more visible irritation. The vulva may look red and swollen, and the skin can appear dry or cracked. BV, on the other hand, typically leaves the external tissue looking normal. Some people with BV experience itching or burning during urination, but visible inflammation of the vulva or vaginal opening is uncommon.
The Smell Is Often More Noticeable Than the Look
For many people, the odor is what gets their attention before any visual change. BV produces a distinct fishy smell caused by specific chemical compounds (putrescine and cadaverine, among others) that bacteria release as they multiply. These compounds are produced in high concentrations when BV-associated bacteria dominate the vaginal environment, and they’re either absent or barely detectable in a healthy vagina.
The smell tends to be stronger after sex and during menstruation, because both semen and blood raise vaginal pH, which causes more of these compounds to become airborne. If you’re noticing an unusual odor alongside thin grayish discharge, that combination points strongly toward BV rather than other infections.
Many People With BV Have No Visible Signs
It’s worth knowing that many people with BV have no symptoms at all. No unusual discharge, no odor, no itching. The infection can exist without producing any visible changes, which is one reason it often goes undiagnosed. Roughly 23 to 29 percent of women of reproductive age worldwide have BV at any given time, and a significant portion of them don’t know it.
This matters because untreated BV, even without symptoms, can increase vulnerability to sexually transmitted infections and cause complications during pregnancy. So the absence of visible signs doesn’t necessarily mean everything is fine if you have other reasons to suspect an imbalance.
What Happens During a Clinical Exam
When a healthcare provider examines someone for BV, they’re looking at some of the same things you’d notice at home, plus a few things that require lab tools. The clinical checklist includes four markers: a smooth, even coating of discharge on the vaginal walls, vaginal pH above 4.5 (healthy pH sits between 3.8 and 4.5), a fishy smell when a chemical solution is added to a sample of the discharge, and the presence of “clue cells” under a microscope.
Clue cells are normal vaginal cells that have become so covered in bacteria that their edges look fuzzy or stippled rather than smooth. You can’t see them without magnification, but they’re one of the most reliable indicators of BV. If three of the four markers are present, the diagnosis is confirmed.
What Changes After Treatment
Treatment for BV typically involves antibiotics taken orally or applied as a vaginal gel or cream over five to seven days. As the bacterial balance shifts back toward normal, the discharge gradually returns to its usual color, thickness, and volume. The fishy odor fades as the bacteria producing those compounds are suppressed.
Most people notice improvement within a few days of starting treatment. If symptoms fully resolve, no follow-up visit is needed. However, BV has a frustratingly high recurrence rate. Many people experience it again within months, so becoming familiar with what the early visual signs look like for your body can help you catch it sooner next time.