Bacterial vaginosis (BV) carries more serious health risks than a yeast infection, particularly when left untreated. While both conditions cause discomfort, BV is linked to pelvic inflammatory disease, increased vulnerability to sexually transmitted infections, and significant complications during pregnancy. A yeast infection, by contrast, is mostly a localized nuisance that rarely leads to anything beyond itching and irritation.
That said, “worse” depends on what you mean. In terms of day-to-day symptoms, many people find yeast infections more physically miserable. In terms of what can happen if you ignore it, BV wins by a wide margin.
How Symptoms Compare
BV and yeast infections affect the vagina in different ways, and the symptoms don’t overlap as much as you might expect. BV typically causes a thin, gray or yellow discharge with a strong fishy odor. The smell is often the most noticeable symptom, sometimes becoming stronger after sex. Irritation and itching can occur but tend to be mild.
Yeast infections produce a thick, white, cottage cheese-like discharge that usually has no odor at all. What makes yeast infections feel worse on a daily basis is the intense itching, burning, and swelling around the vulva. Urination and sex can be painful. For many people, the physical discomfort of a yeast infection is harder to tolerate in the moment, even though the condition itself is less medically concerning.
Why BV Poses Greater Health Risks
The reason BV is considered the more serious condition has nothing to do with how it feels and everything to do with what it does inside your body when untreated. BV disrupts the vaginal microbiome in ways that make you more susceptible to sexually transmitted infections, including HIV, chlamydia, and gonorrhea. The protective bacteria that normally act as a barrier are depleted, leaving the vaginal lining more vulnerable.
BV is also frequently present in people diagnosed with pelvic inflammatory disease (PID), an infection of the uterus, fallopian tubes, or ovaries that can cause chronic pain and fertility problems. The CDC notes that BV is often found alongside PID, though researchers are still working out whether treating BV directly reduces PID rates.
Yeast infections don’t carry these downstream risks. They’re caused by an overgrowth of fungus rather than a bacterial imbalance, and they stay confined to the vaginal area. An untreated yeast infection can worsen and become extremely uncomfortable, but it won’t set off a chain of complications in other reproductive organs.
BV During Pregnancy Is Especially Concerning
The gap between these two conditions widens considerably during pregnancy. Untreated BV is associated with preterm birth, low birth weight, and serious complications for newborns. In one study published in Frontiers in Surgery, women with BV had a preterm birth rate (before 34 weeks) of 22.7%, compared to 6.2% in women without BV. Their babies had a lower median birth weight: about 2,450 grams versus 2,950 grams.
The newborn outcomes were even more striking. Babies born to mothers with BV had more than double the rate of NICU admission (41.7% vs. 19.0%), nearly four times the rate of respiratory distress syndrome, and significantly higher rates of needing a breathing tube after delivery. Over half of the placentas in the BV group showed signs of infection.
Yeast infections during pregnancy are common (hormonal changes make them more likely) but don’t carry these risks. They’re treated the same way as outside of pregnancy, typically with topical antifungal creams.
Treatment Is Simpler for Yeast Infections
One of the practical reasons yeast infections feel more manageable is that you can treat them yourself. Over-the-counter antifungal creams and suppositories are widely available at any pharmacy. For stubborn or recurring infections, a doctor can prescribe a single-dose oral antifungal.
BV requires prescription antibiotics. There’s no effective over-the-counter treatment, and home remedies won’t resolve the bacterial imbalance. Treatment typically involves oral antibiotics or a prescription vaginal cream. This means BV always requires a medical visit, which can be a barrier for people without easy access to care.
Both conditions have frustratingly high recurrence rates. BV is particularly notorious for coming back, sometimes within weeks of finishing antibiotics. Yeast infections also recur, especially in people with diabetes, weakened immune systems, or those taking antibiotics for other conditions (since antibiotics can disrupt vaginal flora and trigger yeast overgrowth).
Telling Them Apart at Home
Because the treatments are completely different, knowing which condition you have matters. Antibiotics won’t help a yeast infection, and antifungal cream won’t clear BV. Using the wrong treatment wastes time and lets the actual problem progress.
The most reliable clues are discharge and odor. If you have thin, grayish discharge with a fishy smell, that points toward BV. Thick, white, odorless discharge with significant itching points toward yeast. But these patterns aren’t foolproof, and some people have both infections at the same time.
Over-the-counter vaginal pH test kits are available, but the FDA cautions that they have real limitations. An elevated pH can suggest BV (which raises vaginal pH above 4.5), but pH changes can also happen for other reasons, including recent sex, menstruation, or use of certain products. A normal pH result might suggest a yeast infection, since yeast doesn’t typically change pH, but it doesn’t confirm one. These tests can’t differentiate between types of infection. A doctor uses a combination of pH testing, microscopic examination, and other clinical criteria to make a definitive diagnosis.
The Bottom Line on Severity
If you’re comparing the two strictly by medical risk, BV is the more dangerous condition. It can lead to pelvic inflammatory disease, increase your chances of contracting STIs, and cause serious pregnancy complications. Yeast infections are uncomfortable, sometimes intensely so, but they don’t carry those same consequences.
If you’re comparing by how miserable they make you feel day to day, yeast infections often win that contest. The itching, swelling, and burning can be disruptive in a way that BV’s milder irritation sometimes isn’t. That’s actually part of the problem with BV: because it can be relatively subtle, or even symptomless in some cases, people may not seek treatment until complications have already developed.