The most common symptom of bacterial vaginosis (BV) is a thin, grayish-white vaginal discharge with a noticeable fishy smell, especially after sex. But here’s what surprises many people: the majority of women with BV have no symptoms at all. When symptoms do appear, they range from mild discharge changes to burning and itching that can affect your daily comfort.
The Five Main Symptoms
BV produces a recognizable pattern of symptoms, though not everyone experiences all of them. The CDC lists these as the primary signs:
- Thin white or gray discharge. The discharge tends to be watery or milky in consistency and can be heavier than what you’re used to. Some people notice a greenish tint.
- A strong fishy odor. This is often the symptom that prompts people to seek help. The smell typically becomes more noticeable after sex or during your period, because semen and menstrual blood are both alkaline, which triggers the release of the compounds responsible for the odor.
- Vaginal itching or irritation. This can occur inside the vagina or around the vulva. It tends to be milder than the intense itching associated with yeast infections.
- Burning during urination. As urine passes over irritated vaginal tissue, it can sting or burn. This symptom sometimes gets mistaken for a urinary tract infection.
- Pain or burning in the vagina. Some people feel general discomfort or soreness, though BV is less likely to cause sharp pain compared to other vaginal infections.
These symptoms can come and go. Some people notice them for a few days and then they seem to resolve, only to return. This fluctuation is part of what makes BV tricky to pin down without a proper test.
Why Most Cases Go Unnoticed
In a nationally representative survey cited by the CDC, the majority of women with BV were asymptomatic. That means they had the bacterial imbalance but felt completely fine. This is significant because untreated BV, even without symptoms, can increase your vulnerability to sexually transmitted infections and cause complications during pregnancy, including a higher risk of preterm birth.
There’s no reliable way to know you have BV without testing if you aren’t experiencing symptoms. It’s sometimes detected incidentally during routine gynecological exams or STI screenings.
BV vs. Yeast Infection: Key Differences
These two conditions are easy to confuse, and many people treat themselves for a yeast infection when they actually have BV. The differences come down to three things: the type of discharge, the presence of odor, and the level of pain.
BV discharge is thin, watery, and grayish with a strong fishy smell. Yeast infection discharge is thick and white, often described as looking like cottage cheese, and it typically has little to no odor. Itching occurs with both, but yeast infections tend to cause more intense itching along with pain, particularly during intercourse. BV can cause irritation, but significant pain is less common.
This distinction matters because the treatments are completely different. Antifungal creams won’t clear BV, and antibiotics won’t resolve a yeast infection. Using the wrong treatment can give the actual infection more time to persist or worsen.
What Happens During Diagnosis
If you go in with symptoms, a healthcare provider will typically do a few straightforward things. They’ll look at the discharge, check your vaginal pH, and may examine a small sample under a microscope.
Normal vaginal pH sits at 4.5 or below. A reading above 4.5 suggests the environment has become less acidic, which is a hallmark of BV. Under the microscope, the provider looks for what are called “clue cells,” which are normal vaginal cells that have become coated with bacteria. When found, clue cells are a highly reliable indicator of BV, with up to 98% specificity. That means if clue cells are present, it’s almost certainly BV and not something else.
The whole process is quick. You’ll usually get results the same day, and in many cases, your provider can tell you what’s going on during the appointment itself.
What BV Feels Like Day to Day
For people with noticeable symptoms, BV is more uncomfortable and embarrassing than painful. The odor tends to be the most distressing part. It can make you self-conscious during sex, at the gym, or in close social situations. Some people describe a persistent “off” feeling, like something isn’t right, without being able to pinpoint a single dramatic symptom.
The discharge can be heavy enough to require panty liners throughout the day. The itching, when present, is usually a low-grade annoyance rather than the kind of intense itch that keeps you up at night. Burning during urination is intermittent for most people and tends to be mild.
BV also has a frustrating tendency to recur. About half of people treated for BV experience a recurrence within 12 months. If your symptoms keep coming back, that pattern itself is worth discussing with a provider, since there are longer-term management strategies that can help break the cycle.