Bacterial vaginosis (BV) produces a thin, white or gray discharge that often has a fishy smell. Unlike a yeast infection, which causes thick, clumpy discharge, BV discharge is watery or milky in consistency and tends to coat the vaginal walls smoothly. More than half of people with BV have no visible symptoms at all, which is why the condition often goes unnoticed.
What BV Discharge Looks Like
The hallmark sign of BV is a change in vaginal discharge. The discharge is typically thin and homogeneous, sometimes described as having a milk-like consistency. Its color ranges from off-white to grayish, and it may appear slightly foamy. It spreads evenly rather than clumping together, which gives it a smooth, almost watery quality when you notice it on underwear or toilet paper.
The amount of discharge varies. Some people notice only a slight increase over what’s normal for them, while others see a more obvious change. The discharge itself doesn’t usually contain blood or have a chunky texture. If you’re seeing thick white clumps, that points more toward a yeast infection than BV.
The Smell Is Often the Biggest Clue
BV is more noticeable by smell than by sight. The discharge carries a distinct fishy odor that tends to get stronger after sex. This happens because semen is alkaline, which triggers the release of odor-causing compounds from the overgrown bacteria. The smell can also become more noticeable during your period for the same reason: blood raises vaginal pH.
Not everyone with BV experiences the odor, but when it’s present, it’s usually the symptom that prompts people to seek help. The smell is different from the mild, slightly acidic scent that healthy vaginal discharge normally has.
What BV Doesn’t Look Like
BV rarely causes visible redness, significant swelling, or sores on the vulva or vaginal walls. Some people experience mild itching or burning around the outside of the vagina, but dramatic inflammation isn’t typical. This is one of the key ways BV differs from other vaginal infections.
Comparing the three most common causes of abnormal discharge helps narrow things down:
- Bacterial vaginosis: Thin, grayish or white, fishy-smelling discharge. Minimal irritation or redness.
- Yeast infection: Thick, white, odorless discharge that looks like cottage cheese. Often accompanied by intense itching and a white coating in and around the vagina.
- Trichomoniasis: Frothy, yellow-green discharge with a bad smell. May have spots of blood and cause noticeable soreness or redness.
If your discharge is yellow, green, or blood-streaked, that’s not consistent with BV and suggests something else is going on.
Why You Might Not See Anything at All
Over half of all people with BV have no symptoms. The bacterial imbalance is still present, but it doesn’t produce enough discharge or odor to be noticeable. This is why BV is sometimes discovered during a routine exam rather than from something you spotted on your own. It’s also why relying purely on appearance to identify BV has limits.
How BV Is Confirmed
Because BV’s visible signs overlap with other conditions, a clinical exam gives a more reliable answer than self-diagnosis. Clinicians look for at least three of these four markers: the characteristic thin, milky discharge; a vaginal pH above 4.5 (higher than the normal acidic range); a fishy odor when the sample is exposed to a chemical solution; and the presence of “clue cells” under a microscope.
Clue cells are vaginal wall cells that have become coated with bacteria, giving them fuzzy, irregular borders instead of clean edges. They’re the most definitive visual marker of BV, but you’d need a microscope to see them. At-home pH test strips can detect an elevated pH, which is suggestive of BV, but a high pH alone doesn’t confirm it since trichomoniasis and other conditions also raise vaginal pH.
What to Expect From Treatment
BV is treated with prescription antibiotics, available as either oral pills or a vaginal gel or cream. Most treatment courses run five to seven days. Symptoms like discharge and odor typically start improving within two to three days of starting treatment, though finishing the full course matters for clearing the infection.
BV has a high recurrence rate. Roughly half of people who are treated will experience it again within 12 months. Recurrent BV doesn’t look any different from a first episode, so if you’ve had it before, you’ll likely recognize the same thin, grayish discharge and fishy smell returning. Keeping track of what your normal discharge looks like makes it easier to spot changes early.