BV sometimes clears on its own, but you shouldn't count on it. Mild cases can resolve when normal vaginal bacteria rebound, yet untreated BV raises the risk of acquiring HIV and other STIs and, in pregnancy, of preterm birth. A short course of antibiotics cures most episodes, so most people with symptoms should get treated.
most common cause of discharge, ages 15–44
but linked to sex
or clindamycin
| Item | Value |
|---|---|
| US women affected | ~29% — most common cause of discharge, ages 15–44 |
| Recurs within 12 mo | >50% |
| An STI? | no — but linked to sex |
| Cure | metronidazole — or clindamycin |
Can BV be cured, or does it just keep coming back?
Bacterial vaginosis isn't a single germ you catch and clear; it's an imbalance. Normally your vagina is dominated by Lactobacillus species that keep it acidic and inhospitable to other bacteria. In BV, those protective lactobacilli drop off and a mix of anaerobic bacteria takes over CDC. So "cure" here works a little differently from curing a classic infection: antibiotics knock the anaerobes back, but lasting relief depends on whether your healthy bacteria re-establish themselves.
BV is the most common vaginal condition in women ages 15–44. It isn't classified as a traditional sexually transmitted infection, though it's strongly linked to sexual activity, and people who've never been sexually active rarely get it. Standard antibiotics cure most acute episodes, but BV recurs in a large share of women within a year. It does sometimes resolve on its own. Treatment is faster, more reliable, and protects you from the downstream risks of leaving it alone.
What "cure" actually means with BV
A cure means the symptoms go away and the bacterial balance shifts back toward normal: the thin grayish discharge and the fishy odor that's often stronger after sex. It does not mean you're immune. Because BV is an ecosystem problem, the same imbalance can return even after a perfect course of antibiotics, especially with new partners, douching, or other disruptions to the vaginal environment. Treatment resets the balance without building permanent protection. If you're unsure whether what you're feeling is BV versus a yeast infection or something else, the discharge and odor pattern is the clue. Read more on bv symptoms and confirm with bv testing rather than guessing.
The treatment that clears it
BV is treated with a defined course of antibiotics — pills or a vaginal cream/gel — and the CDC's 2021 guidelines list a few equally reasonable options CDC STI Guidelines, 2021:
- Metronidazole 500 mg by mouth twice daily for 7 days.
- Metronidazole 0.75% gel, one 5 g applicator inserted into the vagina once daily for 5 days.
- Clindamycin 2% cream inserted into the vagina at bedtime for 7 days.
A few practical notes catch people off guard. The old warning to avoid all alcohol with metronidazole has been walked back; the 2021 guidance says refraining isn't necessary, because there's no convincing evidence of a reaction. Routine treatment of male partners is not recommended for BV. And clindamycin cream and ovules are oil-based, so they can weaken latex condoms during use and for a few days after. Plan around that if condoms are your method.
Treatment is a fixed course, and the single biggest mistake is stopping early. Finish every dose even once the odor and discharge fade. For the full breakdown of regimens, recurrence plans, and what to do if you're pregnant, see our deeper guide on treatment. If you're weighing where to start, get tested first so you're treating the right thing.
Why symptoms fading isn't the same as cured
BV symptoms can quiet down on their own for a few days even without treatment, with the odor coming and going, often flaring after sex or around your period. That waxing and waning is why people assume it "went away," stop paying attention, and then it roars back. Feeling better doesn't prove the bacterial balance has recovered. The anaerobes can still be dominant while symptoms are mild.
This is also why finishing the full antibiotic course matters. Cutting it short when you feel better leaves the door open for a fast return and makes recurrence more likely. If symptoms persist after you complete treatment, go back to your clinician rather than starting a random second course on your own.
Follow-up and retesting
A routine test-of-cure isn't generally needed if your symptoms resolve. Watch for recurrence instead. BV is defined as recurrent when you have three or more episodes in a year, and that pattern usually isn't fixed by simply repeating another single course SASGOG. Recurrent BV often calls for a longer, months-long maintenance regimen — for example, suppressive vaginal gel used on a schedule — which your clinician can tailor. If you're caught in a back-and-forth cycle, you need a different strategy, not the same one again.
Because BV travels with other infections and the same exposures can mean more than BV, it's worth knowing the right timing to screen — see when to test after exposure if a recent partner is part of the picture.
What happens if you leave BV untreated
Untreated BV isn't only an odor problem. The loss of protective lactobacilli changes the vaginal environment in ways that matter for health:
- It raises the risk of acquiring or transmitting HIV and other STIs. A meta-analysis of more than 30,000 women found BV increased the risk of acquiring HIV by about 60% Atashili et al., since the disrupted environment is simply more vulnerable to infection.
- In pregnancy, BV raises the risk of preterm delivery (giving birth too early) and low birth weight, both of which carry real consequences for the baby. If you're expecting, this is worth discussing promptly; see our guide to bv in pregnancy.
- Untreated imbalance can also make you more susceptible to infection after gynecologic procedures and contributes to ongoing discomfort and recurrence.
None of this means you should brush BV off in a panic. The downside of treating is tiny and the downside of ignoring it isn't, so treating symptomatic BV is the sensible call.
When to see a clinician
See a clinician if you have new or persistent abnormal discharge, a fishy odor, or itching and irritation, especially if symptoms recur after treatment, or if you're pregnant. Diagnosis is quick: most cases are confirmed from a simple sample — a self-collected swab or a brief exam — with results usually back within a few days. It's free or low-cost at health departments, Planned Parenthood, and Title X clinics. A BV diagnosis is common and treatable; clinics handle it daily, and it says nothing about you as a person.
To prevent recurrence, don't douche, use condoms correctly every time (which also lowers risk for the sexually transmitted infections BV travels with), and consider limiting the number of partners. If you're choosing where to test, you can compare testing providers to find the most convenient option.