Is BV a sign of cheating? All about bacterial vaginosis

Everything you need to know about BV causes, symptoms, treatment, & prevention

It’s Monday morning after a wild (pre-Covid) weekend and, as you sit down on the toilet to pee, you notice an… unusual… odor. It’s coming from your vagina. And to top it off, you realize that your favorite pair of underwear is now ruined thanks to a layer of thin, grayish discharge. 

Is it just a really bad hangover, or does that scent sort of remind you of a fishing pier at low tide? Hate to break it to you, but it’s probably not the hangover: More likely, it’s a common vaginal infection known as bacterial vaginosis. Don’t panic: BV is treatable and, while uncomfortable, it’s not a serious or life-threatening condition. 

Here’s everything you need to know about bacterial vaginosis, including what causes it, common signs and symptoms, ways to treat it, and – if you happen to be in a relationship – whether or not it could be a sign of infidelity. 


What is bacterial vaginosis (BV)?

Bacterial vaginosis (often abbreviated to BV) is a vaginal infection estimated to impact somewhere around 21.2 million (so, 29.2%) people AFAB ages 14–49 in the US.1 It’s a common condition that has a lot to do with that little ecosystem in your crotch, your vaginal microbiome. 

Quick science lesson: Human bodies are made up of just as much bacteria as they are actual human cells (wild, right?!).2 This includes our vaginas, which contain up to 20 different species of lactobacillus bacteria alone.3 Lactobacilli are the good guys: If you’ve read our article on vaginal pH balance, you’ll recall that these bacteria play a key role in keeping the vagina acidic – specifically, at a pH of between 3.5 and 4.5. 

Vaginas also contain a certain amount of “bad” bacteria, most of which are anaerobic species. These bacteria can’t survive as well in an acidic environment, which is why the acid-producing lactobacilli are so important: They keep your vaginal microbiome in check and prevent infections from taking hold. 

However, if certain endogenous (internal, i.e. hormone fluctuations) or exogenous (external, i.e. semen entering the vagina) factors suddenly increase your vaginal pH, things can get out of whack. With a higher pH, “bad” bacteria have a more pleasant environment in which to expand and flourish – which they very happily do. 

For most people with vaginas, an imbalance in vaginal pH leads to one of two things: A yeast infection or bacterial vaginosis. While the former has to do with the overgrowth of a naturally-present fungus, candida albicans, the latter – BV – is all about those “bad,” anaerobic bacteria. 

Researchers have found that the following species of bacteria and microorganisms are most commonly associated with bacterial vaginosis:4

  • Gardnerella vaginalis
  • Anaerobic Prevotella, Porphyromonas and Bacteroides
  • Peptostreptococcus 
  • Mycoplasma hominis
  • Ureaplasma urealyticum
  • Mobiluncus 

Of these, G. vaginalis is by far the most common indicator of BV, although it is usually a collection of organisms that are the culprit.4

The same study also found that species of Lactobacillus were present in lower concentrations in individuals with bacterial vaginosis than in those with a normal vaginal examination. 

PS: Major bonus points if you just tried to pronounce all of those bacteria names out loud. 


Bacterial vaginosis signs & symptoms

The most common symptoms of bacterial vaginosis include:56

  • Gray, off-white, or greenish vaginal discharge, usually thin and watery
  • A foul-smelling, “fishy” vaginal odor that’s more noticeable after sex or after your period
  • Vaginal itching or irritation
  • Burning when you pee
  • Vaginal soreness or discomfort

Some folx won’t experience any symptoms with BV, or they may only notice a change in discharge or vaginal odor. Also, keep in mind that symptoms of BV can sometimes mirror those of a yeast infection or various STIs. 

When in doubt, it’s always best to talk to your healthcare provider or OB-GYN if you’re experiencing any changes in vaginal discharge, odor, or itching/burning. If you’re not sure if you have BV or a yeast infection, hold off on trying to treat for one or the other until you’ve spoken to a health professional. 

How is BV diagnosed?

There are two ways your provider can diagnose bacterial vaginosis: By looking at a set of clinical criteria 

or by performing a test called a Gram stain, which the CDC calls the “gold standard laboratory method for diagnosing BV.”

A Gram stain is a lab test that measures the relative concentration of lactobacilli (“good” bacteria) against other types of “bad” bacteria present in your vaginal fluid (discharge). 

Your provider may not feel that a Gram stain is necessary to confirm whether or not you have BV, and may instead rely on clinical criteria to make a diagnosis. As outlined by the CDC, your provider will need to see at least three of the following signs or symptoms:7

  • Discharge that smoothly coats the vaginal walls;
  • Clue cells (e.g., vaginal epithelial cells studded with adherent coccobacilli) on microscopic examination;
  • A vaginal pH of 4.5 or higher;
  • A fishy odor of vaginal discharge before or after addition of 10% KOH (the “whiff test”)

Causes of BV

Fundamentally, bacterial vaginosis is “caused” by an imbalance of the vaginal microbiota. But there are a number of factors that put certain people at a higher risk for BV. They include: 

Being sexually active: It’s a common misconception that you can only get BV if you’re having sex, but that’s not the case: Anyone with a vagina can get bacterial vaginosis. However, being sexually active significantly increases your risk for BV – especially if you have multiple partners, aren’t using condoms or other barrier methods, are someone with a vulva whose partner also has a vulva, and/or just started sleeping with someone new.6 

Researchers have yet to fully understand why sexual activity is linked with BV. Some recent research did, however, find an interesting link between BV and oral sex: Turns out, a common type of bacteria found in the mouth (that’s also is linked with gum disease and dental plaque) may be a culprit. It’s called fusobacterium nucleatum, and it appeared to spur the growth of other bacteria implicated in BV.8

Pregnancy: According to the American Pregnancy Association, “10% – 30% of pregnant women will experience bacterial vaginosis (BV) during their pregnancy.”9 Another study found that up to 50% of pregnant people will have BV at some point during their pregnancy.10 This is likely thanks to the rollercoaster of hormonal fluctuations pregnant individuals experience (more on that below). 

Intrauterine devices (IUDs): A few different studies have been conducted to investigate the relationship between IUD use and prevalence of bacterial vaginosis, with mixed findings. While some studies found no correlation between the two, several found that IUD wearers had an increased risk of BV. 

According to one report, “Possible explanations for an association between IUD use and BV acquisition include increased anaerobic bacteria in the vagina due to the presence of a string in the vagina or a foreign body in the uterus, or increased volume and duration of menstrual flow in users of the copper IUD.”11 

Period blood, BTW, has a higher pH than the vagina’s ideal range, so getting your period can sometimes throw off your delicate vaginal microbiome. 

Douching: Douching is a bigtime no-no when it comes to BV prevention. Douches, feminine deodorants, sprays, and perfumed washes will all significantly alter and upset your vaginal pH balance. Your vagina is self-cleaning, so there’s never a good reason to try to “wash it out” – all you need to keep your vulva happy is good ol’ H2O. To put it plainly, out-of-balance vaginal pH = bad bacteria take over = BV!12

Hormonal changes: There’s some research to support the idea that estradiol levels (a form of estrogen) and hormonal fluctuations more generally can impact your risk for BV. As reported in a 2007 study, there appears to be “a trend between lower estradiol and abnormal flora which may explain why BV occurs most commonly at the beginning of the menstrual cycle, when estradiol levels are at their lowest.” 13

Diet: We love donuts and cookie dough as much as the next person, but chronic BV sufferers may want to rethink any added sugars in their diet. As explained in a recent (2020) review of the scientific literature on vaginal microbiota, there’s a definitive link between dietary choices and the health of vaginal lactobacilli

“Diets enriched in nutrients such as vitamins (A, C, D, E), B-carotene and minerals (such Ca and Zn) have been positively related with vaginal wellness, including a reduction in the prevalence of BV and HPV. Meanwhile, diets deficient in these nutrients and hence enriched in sugars (glycemic load) or fats (fatty acids) have negative consequences on homeostasis as well as being related with BV.” 14


Is BV considered an STI?

Technically, no – but it’s complicated. Numerous studies have proven that sexual activity increases one’s risk for bacterial vaginosis, and the CDC even lists BV under their STD Resource website. However, because people who aren’t sexually active can still get BV, it’s not considered an official STD/STI.6

While we’re on the subject: Having BV does put you at an increased risk for contracting STIs like trichomoniasis, HIV, herpes, chlamydia, and gonorrhea.15 All the more reason to stay on top of your health and reach out to a provider if you’re noticing anything weird going on with your vag!

So… Is BV a sign of cheating?

Go ahead and exhale: A case of BV does not mean your partner is cheating! Or, if you’re reading this because your partner, who has a vagina, just got BV – that doesn’t mean they’re cheating, either. 

While a new sexual partner or having many sexual partners may increase one’s risk for bacterial vaginosis, there are a number of other non-sex-related factors (as we outlined above) that can cause it, too. 

If you’re worried that you might have a legit STD/STI, there’s no harm in getting tested. As mentioned previously, BV symptoms can look and feel similar to common STD symptoms. 

Check with your primary care provider, OB-GYN, or a local Planned Parenthood clinic to find out where and how to get tested for STDs. There are even at-home testing kits you can purchase online (but be aware that these kits are not typically covered by insurance). 


How to get rid of BV: Bacterial vaginosis treatment

Treating BV requires an individualized approach, since no two people with the infection will have the same sort of bacterial imbalance (and the root cause often varies widely, as well). That means, unfortunately, that treating recurring BV tends to be a process of trial and error. 

For some (lucky) individuals, BV goes away on its own after a few days or weeks. For others, the symptoms linger and eventually begin to interfere with your day-to-day life – at which point you should talk to your healthcare provider about treatment options. For persistent BV, your doctor might prescribe antibiotics to help clear out the bad bacteria.6

Commonly prescribed antibiotics for BV include:16

  • Metronidazole 
  • Clindamycin
  • Tinidazole

Many of these treatments come in either an oral med, or in a vaginal gel/cream that you insert with an applicator directly into the vagina. 

If your symptoms are mild, here are a few ways to treat bacterial vaginosis at home:*

  • Take a break from sexual activity. Don’t have sex until bacterial vaginosis has cleared up and you’re symptom-free. To prevent future cases, try using condoms or dental dams during penetrative sex and showering after sex. 
  • Try a probiotic supplement. Alternatively, integrate more probiotic foods into your diet, like Greek yogurt, kefir, kimchi, and sauerkraut, to support your vaginal microbiome.
  • Wear cotton underwear. Cotton breathes better than other synthetic materials – and that airflow is great for discouraging the growth of bad (anaerobic) bacteria. Want to take it up a notch? Try sleeping naked for a few nights. 
  • Switch up your period product. The absorbent cotton in tampons, for instance, encourages bacterial overgrowth by trapping and holding menstrual blood against your vaginal walls. Try a menstrual disc, instead: Discs are made from inert materials that won’t alter your vaginal microbiome or throw off your pH levels. If you do use tampons, make sure to change them at least three times daily. 

If you believe you got BV from sexual contact, the Mayo Clinic offers this piece of advice: 

“It’s generally not necessary to treat an infected woman’s male sexual partner, but bacterial vaginosis can spread between female sexual partners. Female partners should seek testing and may need treatment.” 

Treating BV if you’re pregnant

One final note: If you’re pregnant and experiencing BV symptoms, it’s especially important to talk to your healthcare provider and get treated right away. BV can lead to complications in a developing fetus and, while they’re relatively rare, they can include premature delivery and/or low birth weight.16


Bacterial vaginosis: Key takeaways

  • Bacterial vaginosis is a common vaginal infection that’s (fundamentally) caused by an imbalance of good and bad bacteria in the vaginal “ecosystem,” which results in a higher-than-normal vaginal pH
  • You’re at a higher risk for BV if you are sexually active, pregnant, use douches or other vaginal deodorant products internally, have an IUD, or are experiencing hormonal changes or fluctuations
  • Sometimes, BV goes away on its own – but your provider may prescribe antibiotics either orally or vaginally to clear up a persistent case
  • The best way to prevent bacterial vaginosis is by practicing safe sex (especially via barrier method), eating a healthy diet, wearing breathable underwear, and choosing period products that are biologically inert (like a menstrual cup or disc) and that don’t alter vaginal pH

This article is informational only and is not offered as medical advice, nor does it substitute for a consultation with your physician. If you have any gynecological/medical concerns or conditions, please consult your physician.


 © 2021 The Flex Company. All Rights Reserved.

References (Click to open/close)

  1. Centers for Disease Control and Prevention. (2020, February 10). CDC – Bacterial vaginosis statistics. https://www.cdc.gov/std/bv/stats.htm
  2. Sender, R., Fuchs, S., & Milo, R. (2016). Revised Estimates for the Number of Human and Bacteria Cells in the Body. PLoS biology, 14(8), e1002533. https://doi.org/10.1371/journal.pbio.1002533
  3. Young, V. B., Britton, R. A., & Schmidt, T. M. (2008). The human microbiome and infectious diseases: Beyond Koch. Interdisciplinary Perspectives on Infectious Diseases, 2008, 1-2. https://doi.org/10.1155/2008/296873
  4. Hill, G. B. (1993). The microbiology of bacterial vaginosis. American Journal of Obstetrics & Gynecology, 169(2), 450-454. https://doi.org/10.1016/0002-9378(93)90339-KHill, G. B. (1993). The microbiology of bacterial vaginosis. American Journal of Obstetrics & Gynecology, 169(2), 450-454. https://doi.org/10.1016/0002-9378(93)90339-K
  5. Planned Parenthood. (n.d.). What is bacterial vaginosis? Symptoms, signs and causes. https://www.plannedparenthood.org/learn/health-and-wellness/vaginitis/what-bacterial-vaginosis
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  7. Centers for Disease Control and Prevention. (2020, July 8). 2015 STD treatment guidelines: Bacterial vaginosis. https://www.cdc.gov/std/tg2015/bv.htm
  8. Agarwal, K., Robinson, L. S., Aggarwal, S., Foster, L. R., Hernandez-Leyva, A., Lin, H., Tortelli, B. A., O’Brien, V. P., Miller, L., Kau, A. L., Reno, H., Gilbert, N. M., Lewis, W. G., & Lewis, A. L. (2020). Glycan cross-feeding supports mutualism between Fusobacterium and the vaginal microbiota. PLOS Biology, 18(8), e3000788. https://doi.org/10.1371/journal.pbio.3000788
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