Bacterial vaginosis can go away without treatment, but it does so in a minority of cases. In one clinical trial, only about 29% of women given a placebo saw their BV resolve on its own, compared to 77% of those who received antibiotics. There is no reliable timeline for natural resolution, and research has not identified a specific number of days or weeks you can expect to wait for symptoms to clear.
How Often BV Clears on Its Own
The CDC acknowledges that BV will sometimes resolve without treatment, but the odds are not in your favor. The clearest data comes from a study published in the American Journal of Obstetrics & Gynecology, where roughly 29% of women in the placebo group had their BV clear up without antibiotics, while 77% of the antibiotic group recovered. That means about 7 out of 10 women who skip treatment will still have BV weeks later.
There is no established window, like “two weeks” or “one month,” after which you can expect natural resolution. Some women notice symptoms fade within a few weeks, while others carry BV for months. The unpredictability is part of what makes a wait-and-see approach risky if you have noticeable symptoms.
What Has to Happen Inside Your Body
BV develops when the balance of bacteria in the vagina shifts. Normally, beneficial bacteria (primarily Lactobacillus species) dominate and keep the environment acidic by producing lactic acid. In BV, those bacteria get displaced by a mix of anaerobic organisms that thrive in a less acidic environment. These bacteria produce compounds like putrescine and cadaverine, which are responsible for the characteristic fishy odor.
For BV to resolve on its own, Lactobacillus populations need to recolonize and push out the overgrown bacteria. Lactobacillus does this by secreting lactic acid and natural bactericidal substances that inhibit the growth of BV-associated organisms. But this recolonization process is not guaranteed. If the conditions that triggered the imbalance in the first place persist, such as douching, a new sexual partner, or smoking, the beneficial bacteria may struggle to re-establish themselves.
Risks of Waiting It Out
If your BV is truly asymptomatic, meaning it was discovered incidentally during an exam, current CDC guidelines note that treatment is recommended only for women with symptoms. So mild, symptom-free cases may not require immediate action.
However, leaving symptomatic BV untreated carries real risks. BV increases your susceptibility to sexually transmitted infections, including HIV, chlamydia, and gonorrhea. Those infections can in turn lead to pelvic inflammatory disease, which can cause lasting damage to your reproductive organs and make it harder to get pregnant. Treatment reduces these risks, which is why clinicians recommend antibiotics when symptoms are present rather than suggesting you wait and hope for natural resolution.
BV During Pregnancy
Pregnancy adds a layer of concern. BV during pregnancy has been linked to preterm delivery, meaning birth before 37 weeks, which carries serious health risks for the baby including breathing problems and bleeding in the brain. That said, the relationship is not entirely straightforward. Research has not definitively proven that BV causes preterm delivery, and the U.S. Preventive Services Task Force has noted that routine screening and treatment of asymptomatic BV in pregnant women has not been shown to reduce preterm birth rates in large trials. If you’re pregnant and have BV symptoms, your provider will likely recommend treatment. If it’s asymptomatic, the decision is more nuanced.
When Natural Resolution Is Less Likely
Certain patterns make it unlikely that your BV will clear up without help. If you’ve had BV before, recurrence is common regardless of whether the first episode was treated with antibiotics or resolved naturally. Ongoing exposure to the same triggers, like unprotected sex with a partner who may carry BV-associated bacteria, keeps disrupting the vaginal environment before Lactobacillus can fully recover.
If your symptoms have persisted for more than a couple of weeks, or if you notice worsening discharge, stronger odor, or new symptoms like pelvic pain, the infection is unlikely to resolve on its own. Persistent or worsening symptoms suggest the bacterial imbalance is entrenched and needs antibiotic treatment to shift back. A standard course of antibiotics typically clears BV within five to seven days, making it a much faster and more reliable path than waiting for spontaneous resolution that may never come.