Can I Go Swimming With BV? What You Need to Know

Swimming won't give you bacterial vaginosis (BV), and it won't dramatically worsen an active infection, but that doesn't mean it's entirely consequence-free. Pool chemicals, natural water, and sitting in wet swimwear longer than you should can all irritate an already-unhappy vagina, disrupt your pH, or undermine certain treatments if the timing's off.

Here's what you actually need to know about how water affects your vaginal microbiome, when it's worth waiting, and how to protect yourself if you do decide to swim.

What is bacterial vaginosis and why does it happen?

BV and the vaginal microbiome

Bacterial vaginosis is the most common vaginal condition in women. It's caused by an imbalance in the vaginal microbiome, specifically a drop in beneficial bacteria and an overgrowth of harmful bacteria. A healthy vaginal microbiome is typically dominated by Lactobacilli, the beneficial bacteria that produce lactic acid to maintain a low vaginal pH (around 3.8 to 4.5) and protect against harmful microorganisms. When that balance shifts, Lactobacillus levels decline, and harmful bacteria like Gardnerella vaginalis, Prevotella, or Atopobium vaginae take over, leading to BV.

Common triggers include unprotected sex (especially with new or multiple sex partners), hormonal changes, your period, douching, and yes, environmental pH disruptions. Anything that disturbs the acidity of the vaginal environment can create the conditions for BV to emerge or return.

BV symptoms to watch for

BV doesn't always cause noticeable symptoms, which is part of what makes it so tricky. When it does, the most common signs include:

• A thin, greyish, or white discharge
• A strong, fishy odor that is often more noticeable after sex
• Vaginal itching or irritation. 

Most people with BV have no symptoms at all, which is why getting tested is the only reliable way to know what's actually going on.

Swimming with BV: Risks and considerations

How pool and lake water can affect BV

Swimming with active bacterial vaginosis is generally safe unless experiencing significant pain, itching, or irritation. That's because chlorinated, salt-based, or natural lake water can irritate already-sensitive vaginal tissue. That disruption can tip your pH further out of balance, making symptoms worse or creating conditions in which BV-associated bacteria can gain ground.

Natural bodies of water like lakes, rivers, and the sea carry their own considerations. They can harbor a wide variety of bacteria and microorganisms, and while exposure doesn't directly cause BV, introducing new bacteria into an already-disrupted microbiome isn't ideal. Saltwater may have some mild antimicrobial properties, but it's not protective against BV.

Prolonged time in wet swimwear adds another layer of risk. A damp, warm environment around the vulva can encourage bacterial overgrowth and worsen existing irritation, even after you've left the water.

Can you get BV from swimming?

BV isn’t transmitted through water, and there's no definitive evidence that swimming in a pool, lake, or the sea directly causes it. Public health guidance is clear that swimming pools, hot tubs, and natural bodies of water don’t cause BV. You can't "catch" BV from a pool or a lake the way you might catch a waterborne illness.

Some studies have found associations between using unsanitary water for bathing and washing and higher rates of BV in certain populations, but that's a different context from recreational swimming. Exposure to water with a different pH than your vagina (combined with prolonged dampness) may create conditions that aren't ideal for an already-disrupted microbiome and may make BV more likely to return in people who are already susceptible.

Should you wait until BV is treated before swimming?

If treating BV with vaginal creams or suppositories, it is advised to avoid swimming for at least 24 hours after insertion to ensure the medication's effectiveness. Water can wash out topical treatments before they've had a chance to do their job, which could mean slower symptom relief and less effective treatment overall. If you're using metronidazole or clindamycin gel, swimming too soon after application might mean you're not absorbing the full dose.

Even on oral antibiotics, mid-treatment swimming isn't ideal. Your microbiome is in a vulnerable, rebalancing state, and external disruption from water exposure or sitting in damp swimwear for too long can work against that process.

It's also worth giving yourself permission to just... skip it. BV symptoms like unusual discharge and odor can make you feel self-conscious, and the idea of being around people in a swimsuit when you're not feeling your best is completely valid grounds for a rain check. There's no obligation to push through if you'd rather wait until things have cleared up.

If your symptoms are severe or if you're pregnant, speak to a healthcare provider before making any decisions. BV in pregnancy carries additional risks and needs proper medical management.

If you’ve finished your treatment course and symptoms have cleared, swimming is generally fine. If you're still mid-course, it's worth waiting.

How to confirm you have BV before going swimming

The only way to know for certain whether you have BV is to test. If you're experiencing symptoms, your first port of call should be your provider, who can assess and test you directly. It's worth getting checked rather than assuming because BV symptoms like discharge and odor overlap with other vaginal conditions or sexually transmitted infections (STIs).

If you'd prefer to start with at-home testing, Evvy's Vaginal Microbiome Test uses metagenomic sequencing to identify the specific vaginal bacteria in your microbiome, including BV-associated bacteria. It can also screen for yeast infections, trichomoniasis, and aerobic vaginitis, conditions that cause symptoms similar to BV but require different treatments. Unlike standard swabs, which only flag a narrow range of pathogens, Evvy gives you a complete picture of what's actually going on. So whether you're trying to figure out if it's safe to swim or just want to understand your vaginal health better, you're working with real information rather than guesswork.

Tips for protecting your vaginal health around swimming

If you do decide to swim, these steps can help look after your vaginal health:

• Change out of wet swimwear immediately after leaving the water. Prolonged moisture is one of the biggest risk factors for irritation and bacterial overgrowth.
• Rinse with clean, plain water after swimming to remove chlorine, salt, or lake bacteria from the vulvar area. Avoid using soap internally.
• Wear breathable cotton underwear after swimming to allow airflow and reduce moisture build-up.
• If you're using vaginal suppositories or topical treatments, check with your prescriber before swimming. Water can significantly reduce the effectiveness of local therapies.
• Avoid douching or using scented washes before or after swimming. These disrupt the vaginal pH just as much as pool water can.

FAQs about swimming with BV

Does swimming affect BV?

Swimming won't make BV worse, but pool chemicals, saltwater, and natural water bodies can irritate the vulvar and vaginal tissues, which are often already inflamed and sensitive when you have BV. That irritation can add to your discomfort, even if it doesn't affect the infection itself. Staying in wet swimwear for extended periods after swimming compounds this, so changing promptly and rinsing with clean water can make a real difference.

Can BV be caused by a wet swimsuit?

A wet swimsuit alone won't cause BV, but the warm, damp environment it creates around the vulva can encourage the kind of bacterial overgrowth that contributes to BV development in people who are already prone to it. The key is to change out of wet swimwear promptly and keep the area dry and well-ventilated.

Can you get BV from swimming in a lake?

No, BV isn’t waterborne and can’t be transmitted through lake water. Natural bodies of water do contain diverse bacteria, but these don't directly cause BV. What they can do is disrupt the vaginal pH and introduce organisms that place additional stress on an already imbalanced microbiome. If your microbiome is healthy and Lactobacillus-dominant, occasional lake swimming is unlikely to cause BV.

Can swimming throw off pH balance?

Yes. Chlorinated pools, saltwater, and freshwater bodies all have pH levels that differ from the vaginal environment, which sits around 3.8 to 4.5. Prolonged exposure to chlorine and saltwater can irritate sensitive mucous membranes and exacerbate BV symptoms. This doesn't automatically cause BV, but it does create a less protective environment if you’re already prone to imbalances.

Why does BV keep coming back after swimming or water sports?

If BV keeps coming back after swimming, the water probably isn't the main culprit, though it may not be helping. BV has notoriously high recurrence rates, so sometimes it's simply the infection doing what it does, regardless of whether you've been in a pool. Some BV-associated bacteria are also resistant to standard antibiotics, which means that even if your symptoms cleared up after treatment, the underlying bacterial imbalance may never have been fully resolved, making recurrence more likely. If swimming does seem to be a trigger, the issue is usually what happens around it: staying in wet swimwear, irritation from chlorine or saltwater, or anything else that disrupts your natural balance. Changing out of wet swimwear promptly, rinsing with plain water, and avoiding scented products can all help. If symptoms keep returning regardless, speak to your provider. Recurrent BV sometimes needs a different treatment approach, like a longer-term suppressive antibiotic gel, and it's worth ruling out other vaginal infections.