And How to Tell the Difference
The vagina has its own ecosystem. When that ecosystem is balanced, you don't think about it. When it's not, you spend a lot of time at urgent care, on antibiotics, on antifungals, and sometimes on round after round of treatments that don't actually fix the problem.
Three of the most commonly misdiagnosed conditions in women's vaginal health share overlapping symptoms but have completely different causes and require completely different treatments. Bacterial vaginosis, yeast infections, and cytolytic vaginosis can all cause discharge, irritation, and discomfort, but treating the wrong one makes the actual problem worse.
This guide walks through what each condition is, how to tell them apart, why they sometimes get misdiagnosed, and how vaginal microbiome health connects to the bigger picture of urinary tract wellness.
What Is Bacterial Vaginosis?
Bacterial vaginosis (BV) is an inflammatory condition caused by an overgrowth of certain bacteria in the vagina, most commonly Gardnerella vaginalis. It's not technically a sexually transmitted infection, but sexual activity can disrupt the vaginal microbiome enough to trigger it.
In a healthy vagina, Lactobacillus bacteria dominate the environment and produce lactic acid that keeps pH in the protective 3.8 to 4.5 range. When something disrupts that balance (douching, antibiotics, hormonal shifts, new sexual partners, certain lubricants), Gardnerella and other anaerobic bacteria can overgrow, the pH rises above 4.5, and BV develops.
What it looks like: thin, grayish-white discharge.
What it feels like: sometimes mild itching, sometimes nothing at all. Many women have BV without any symptoms.
What it smells like: a distinct fishy odor, especially after sex. This is the most distinguishing feature of BV.
BV is the most common vaginal condition in women of reproductive age. Untreated, it raises the risk of pelvic inflammatory disease, complications during pregnancy, and increased susceptibility to STIs. It also disrupts the vaginal microbiome in ways that can make UTIs more likely.
What Is a Yeast Infection?
Vaginal yeast infections (vulvovaginal candidiasis) are caused by an overgrowth of yeast, most often Candida albicans. About 80% of yeast infections are caused by Candida albicans, with the remaining cases caused by other Candida species.
Yeast naturally lives in the vagina at low levels alongside the bacterial microbiome. When something tips the balance (most commonly antibiotics that kill protective Lactobacillus while leaving yeast untouched, or hormonal changes during pregnancy or with certain birth controls), yeast can overgrow and cause symptoms.
What it looks like: thick, white, cottage cheese-like discharge.
What it feels like: intense itching of the vulva and vagina, redness and swelling of the vulva, burning during urination, painful intercourse.
What it smells like: usually no strong odor, sometimes a faintly yeasty smell.
Yeast infections are the second most common vaginal condition. They're often easy to recognize and treat with antifungal medications, either over-the-counter or prescription.
What Is Cytolytic Vaginosis?
Cytolytic vaginosis (CV) is the condition almost no one talks about, and it's the reason a meaningful number of women get treated for "recurrent yeast infections" that never fully resolve.
CV isn't an infection. It's an imbalance caused by too much of the protective Lactobacillus bacteria. When Lactobacillus overgrows beyond healthy levels, vaginal pH drops too low (below 3.8), the environment becomes excessively acidic, and the resulting acid actually starts to break down vaginal cells. The cellular breakdown is what causes the symptoms.
What it looks like: white discharge that often resembles yeast infection discharge.
What it feels like: itching, redness of the vulva, painful urination, painful intercourse. The symptoms closely mimic yeast infections.
The misdiagnosis problem: because CV looks and feels so similar to yeast, it's frequently treated with antifungal medications. Antifungals don't help (because there's no yeast), and the cycle continues. Some women receive multiple courses of antifungals before anyone considers CV.
CV is most often diagnosed when "recurrent yeast" doesn't respond to standard treatment, when symptoms worsen mid-cycle (Lactobacillus levels naturally rise during the luteal phase), or when a clinician specifically tests vaginal pH and finds it abnormally low rather than abnormally high.
How to Tell BV, Yeast, and CV Apart
The patterns that distinguish them:
BV has a fishy odor and grayish discharge, and pH is high (above 4.5).
Yeast has thick white cottage-cheese discharge, intense itching, no strong odor, and pH is normal (3.8 to 4.5).
CV has white discharge resembling yeast, similar itching and burning, no strong odor, and pH is low (below 3.8).
The most diagnostic test is a vaginal pH check, which can be done in a clinical setting or with at-home pH strips. A microscopy test (looking at vaginal discharge under a microscope) can confirm which microorganisms are present.
If you've been treated repeatedly for yeast infections and they keep coming back without ever fully resolving, ask your provider about CV specifically. It's underdiagnosed because most providers default to BV or yeast as the explanation for vaginal symptoms.
Treatment Options
Each condition requires a different approach.
BV is treated with antibiotics, most commonly metronidazole or clindamycin (oral or vaginal). Boric acid suppositories are also used, particularly for recurrent BV, because they help restore healthy pH.
Yeast infections are treated with antifungal medications, either over-the-counter (miconazole, clotrimazole) or prescription (oral fluconazole). Boric acid can also help with recurrent or resistant yeast.
Cytolytic vaginosis requires the opposite approach from BV or yeast. The goal is to raise vaginal pH back into the healthy range by reducing Lactobacillus dominance. This is typically done through baking soda (sodium bicarbonate) sitz baths or douching, both of which gently neutralize the over-acidic environment. Avoid Lactobacillus-containing probiotics, which can worsen CV. This is one of the few situations in vaginal health where adding more "good" bacteria is the wrong move.
Boric acid is worth mentioning specifically because it shows up across all three. It's an over-the-counter vaginal suppository (never taken orally) that helps restore pH balance regardless of whether the imbalance is too acidic or too alkaline. It's well-supported by research for BV and yeast prevention. It should not be used during pregnancy.
How These Conditions Connect to UTI Risk
The vaginal microbiome and the urinary microbiome are connected. Disruptions in one tend to disrupt the other.
When the vaginal environment is balanced (pH between 3.8 and 4.5, Lactobacillus dominant, no overgrowth of Gardnerella or yeast), E. coli has a harder time colonizing the vaginal area. Less E. coli colonization means less bacterial introduction into the urethra during sex, which means lower UTI risk.
When the vaginal microbiome is disrupted (BV, recurrent yeast, antibiotic use, hormonal shifts), E. coli has more room to colonize. Bacterial introduction into the urethra becomes more common, and UTIs follow.
This is part of why women who experience recurrent BV or yeast often also experience recurrent UTIs. The conditions share underlying microbiome disruption as a driver.
UTI Biome Shield supports the vaginal and urinary microbiome together. The clinical-dose A-type cranberry PACs block E. coli adhesion to the bladder wall, which is the specific mechanism behind 85% of UTIs. The whole-fruit polyphenols and zinc support immune function and tissue integrity. Daily use creates a baseline of microbiome support that complements vaginal health, even though it's not specifically a BV or yeast treatment.
For active vaginal infections, see a healthcare provider. For ongoing microbiome support and UTI prevention, daily protocols and microbiome-aware lifestyle choices (avoiding douching except for CV management, choosing pH-balanced lubricants, treating UTIs and antibiotic courses thoughtfully) make a real difference.
When to See a Provider
For any of these conditions, see a healthcare provider if:
You've never had vaginal symptoms before and aren't sure what's happening.
Symptoms don't improve after a course of standard treatment.
Symptoms keep coming back despite repeated treatment, especially if you've been told it's "recurrent yeast" but treatment isn't fully working.
You experience pelvic pain, fever, abnormal bleeding, or pain that isn't typical of vaginal infection.
You're pregnant.
You're not sure which condition you have.
Recurrent vaginal symptoms warrant a workup beyond standard urgent care, ideally with a gynecologist or vulvovaginal specialist who can run pH tests, microscopy, and culture to identify the actual cause.
The vaginal microbiome is its own ecosystem with its own rules. Treating it as a body part that should be self-managing is part of what keeps women cycling through misdiagnoses and ineffective treatments. You deserve real answers about what's happening in your body, not just another antibiotic.
Frequently Asked Questions
How can I tell if I have BV or a yeast infection?
The clearest distinguishing signs: BV has a fishy odor and grayish discharge with mild or no itching, while yeast infections have thick white cottage-cheese discharge with intense itching and no strong odor. Vaginal pH is high (above 4.5) with BV and normal (3.8 to 4.5) with yeast. If you're not sure, see a provider for testing rather than guessing, because treating the wrong condition makes the actual problem worse.
What is cytolytic vaginosis and why don't more people know about it?
Cytolytic vaginosis is an imbalance caused by too much Lactobacillus, which makes the vagina excessively acidic and breaks down vaginal cells. It's underdiagnosed because its symptoms closely resemble yeast infections, and most providers default to yeast as the diagnosis for white discharge and itching. Many women with CV are treated repeatedly for "recurrent yeast" without improvement until a provider checks pH and finds it abnormally low.
Can probiotics help with BV or yeast infections?
Lactobacillus-containing probiotics may help with BV by restoring protective bacteria. They generally don't help with yeast infections directly. They can make cytolytic vaginosis worse by adding to the Lactobacillus overgrowth that's driving the condition. Probiotics aren't universally beneficial for vaginal health and shouldn't be used reflexively without knowing what's causing your symptoms.
Is boric acid safe for vaginal use?
Yes, when used as directed. Boric acid suppositories are over-the-counter and well-supported by research for BV and yeast prevention. They help restore healthy vaginal pH. Boric acid should never be taken orally (it's toxic if swallowed) and shouldn't be used during pregnancy. Otherwise, it's a useful tool for women managing recurrent vaginal infections.
Why do BV and yeast keep coming back?
Recurrence usually means the underlying microbiome disruption hasn't been addressed. Antibiotics that treat BV also disrupt protective Lactobacillus, which can lead to yeast or repeat BV. Hormonal shifts, certain birth controls, sexual activity, douching, and irritating products can all keep the cycle going. For chronic recurrence, see a vulvovaginal specialist for a comprehensive workup that goes beyond standard testing.
Can BV or yeast cause UTIs?
Indirectly, yes. The vaginal and urinary microbiomes are connected, and disruption in the vaginal microbiome (BV, recurrent yeast) tends to allow E. coli to colonize the vaginal area more easily. From there, E. coli is more likely to be introduced into the urethra during sex, raising UTI risk. Women who experience recurrent vaginal infections often experience recurrent UTIs for the same underlying reason.
Should I douche to treat vaginal infections?
Generally no. Douching disrupts the vaginal microbiome and can make BV and yeast worse. The exception is cytolytic vaginosis, where a sodium bicarbonate (baking soda) sitz bath or gentle douching can help neutralize the over-acidic environment. Don't douche reflexively for any vaginal symptoms, and don't use commercial douches with fragrance or harsh ingredients.
