Bacterial vaginosis (BV) most commonly feels like a noticeable change in vaginal discharge, often accompanied by a distinct “fishy” smell. Some people also experience itching, burning, or irritation in and around the vagina. But here’s the surprising part: more than half of all women with BV have no symptoms at all, meaning it’s entirely possible to have it and feel nothing.
For those who do notice something, the experience ranges from mildly annoying to genuinely uncomfortable. Understanding what the typical sensations are can help you figure out whether what you’re feeling is BV or something else entirely.
The Hallmark Sign: Discharge and Odor
The most recognizable symptom of BV is a change in vaginal discharge. It typically becomes thin, watery, and either off-white, grayish, or slightly greenish. The texture is often described as homogeneous, meaning it looks uniform rather than clumpy or chunky. This is one of the clearest ways to distinguish it from a yeast infection, which produces thick, white, cottage cheese-like discharge.
The smell is what most people notice first. BV produces a “fishy” odor that can range from faint to strong. It tends to become more noticeable after sex and during your period, because both semen and menstrual blood are more alkaline, which releases more of the odor-causing compounds. Those compounds, called amines, are a direct byproduct of the overgrowth of certain bacteria in the vagina. The smell isn’t from poor hygiene. It’s a chemical signal that the bacterial balance has shifted.
Itching, Burning, and Irritation
BV can cause itching both inside the vagina and around the vulva. The sensation is usually milder than the intense itching associated with yeast infections, but it varies from person to person. Some people describe it as a low-grade, persistent irritation rather than a sharp itch.
Burning is another common sensation, particularly during urination. The increased alkalinity and bacterial byproducts can irritate the delicate tissue of the vaginal walls and vulva, so when urine passes over already-irritated skin, it stings. Some people also feel a general soreness or discomfort inside the vagina, not quite pain, but an awareness that something is off. Sexual intercourse can intensify these feelings, with some people reporting discomfort during or after sex.
What’s Happening Inside Your Body
A healthy vagina is home to a community of bacteria dominated by lactobacilli, which produce lactic acid and hydrogen peroxide to keep the environment slightly acidic (a pH below 4.5). This acidity acts like a natural defense system, keeping harmful bacteria in check.
In BV, that balance tips. A species called Gardnerella vaginalis is typically the main driver. It attaches to the vaginal walls and builds a sticky, protective layer called a biofilm, which covers roughly 90% of the vaginal lining in BV cases. This biofilm shields the bacteria from the body’s natural defenses and creates a hospitable environment for other anaerobic bacteria to move in. As these bacteria multiply, they break down protective mucus on the vaginal walls, which contributes to the irritation and increased discharge. They also produce the amine compounds responsible for the fishy smell and push vaginal pH above 4.5.
This biofilm is also a major reason BV is so stubborn. It protects the bacteria from both the body’s immune defenses and from antibiotics, which is directly tied to the high recurrence rate.
When It Feels Like Nothing at All
More than half of women with BV experience zero symptoms. No unusual smell, no discharge changes, no itching. In these cases, BV is typically discovered incidentally during a routine exam or when testing for something else. Asymptomatic BV still involves the same bacterial shift, but the body’s response simply doesn’t produce noticeable sensations. This doesn’t mean it’s harmless in every case, but it does mean the absence of symptoms doesn’t rule it out.
BV vs. Yeast Infection: How They Feel Different
These two conditions are easy to confuse because they share some overlapping symptoms, but the sensory experience is quite different.
- Discharge: BV produces thin, grayish, foamy discharge with a fishy odor. Yeast infections produce thick, white, clumpy discharge that is usually odorless.
- Itching: Yeast infections tend to cause more intense, sometimes unbearable itching and may include visible swelling or a white coating on the vulva. BV itching is typically milder.
- Smell: A strong fishy odor points toward BV. Yeast infections rarely produce a noticeable smell.
- Burning: Both can cause burning during urination, but BV is more likely to cause discomfort during sex, while yeast infections are more likely to cause constant external irritation.
If you’re unsure, a healthcare provider can distinguish between them quickly. One common diagnostic approach checks for thin discharge, elevated vaginal pH (above 4.5), a positive “whiff test” for fishy odor, and the presence of bacteria-coated cells under a microscope. Meeting three of these four criteria confirms BV with about 90% accuracy.
The Frustration of Recurrence
One of the most emotionally and physically draining aspects of BV is how often it comes back. Between 50% and 80% of women who complete antibiotic treatment experience a recurrence within 6 to 12 months. This means many people cycle through the same symptoms repeatedly: the discharge returns, the smell reappears, and the irritation starts again.
The biofilm that bacteria build on the vaginal lining is a major reason for this. Standard antibiotics can reduce bacterial levels enough to resolve symptoms, but the biofilm often survives and allows the bacteria to repopulate. For people dealing with recurrent BV, the experience shifts from a one-time annoyance to a chronic condition that affects daily comfort, sexual confidence, and overall quality of life. The physical sensations may be familiar by the second or third episode, but the emotional toll of “not this again” is a real part of what BV feels like for many people.