Itching. Burning. Discharge that isn't behaving like it usually does. Most women reach for the same drugstore antifungal box every time, and roughly half of them are treating the wrong thing.
Bacterial vaginosis (BV) and vaginal yeast infections are the two most common causes of vaginitis, and they feel similar enough to be confused constantly. But they are opposites underneath: one is bacterial, one is fungal. One raises your vaginal pH, one doesn't. One needs antibiotics, one needs antifungals. Treating BV with an antifungal cream does nothing except delay relief by a week.
This guide covers how to tell them apart at home, when self-diagnosis is a bad idea, and what actually prevents both from coming back.
The quick answer: BV vs yeast infection at a glance
| Bacterial vaginosis | Yeast infection | |
|---|---|---|
| Cause | Overgrowth of anaerobic bacteria (often Gardnerella vaginalis) as protective lactobacilli drop off | Overgrowth of a fungus, usually Candida albicans |
| Discharge | Thin, watery, grey or off-white. Often noticeably more of it | Thick, white, clumpy — the classic cottage-cheese description |
| Odour | Distinctly fishy, stronger after sex and around your period | Usually none |
| Itching | Mild or absent | Intense — usually the dominant symptom |
| Vulva appearance | Typically normal; BV is a vaginal, not vulvar, condition | Red, swollen, sometimes with small splits in the skin |
| Vaginal pH | Above 4.5 | Usually stays normal (3.8–4.5) |
| Treatment | Prescription antibiotics (metronidazole, clindamycin) | Antifungals — OTC clotrimazole or miconazole, or oral fluconazole |
If you remember one line: smell points to BV, itch points to yeast. Thin and grey with an odour is bacterial. Thick and white with relentless itching is fungal.
What bacterial vaginosis actually is
A healthy vagina is dominated by Lactobacillus bacteria. They produce lactic acid, which keeps the environment acidic — usually somewhere between pH 3.8 and 4.5 — and that acidity is what discourages less friendly organisms from setting up shop.
BV happens when the lactobacilli population falls and anaerobic bacteria expand into the space. The pH climbs above 4.5. That shift is what produces the characteristic odour, because the amines these bacteria release become volatile in a less acidic environment. It's also why the smell gets stronger after sex — semen is alkaline — and during your period, for the same reason.
Worth knowing: ACOG describes BV as a change in the vaginal microbiome rather than a true inflammatory infection. That's why BV usually doesn't make your vulva red or swollen, and why the itching is mild if it's there at all. Some women have BV with no symptoms whatsoever.
What raises your risk of BV
- Douching. The single most avoidable risk factor. Rinsing the vagina strips out the lactobacilli you need.
- New or multiple sexual partners. BV isn't classed as an STI, but sexual activity clearly shifts the vaginal microbiome.
- Scented washes, wipes and "feminine hygiene" sprays.
- Recent antibiotics, which knock out good bacteria along with the target.
- An IUD, in some women.
- Smoking, which is associated with lower lactobacilli levels.
What a yeast infection actually is
Candida lives on and in most people's bodies in small amounts without causing any trouble. A yeast infection is what happens when it multiplies past the point your body keeps it in check. Around three in four women will have at least one in their lifetime.
Because Candida is a fungus and thrives in the acidic environment lactobacilli create, your pH often stays perfectly normal during a yeast infection. This is why a drugstore pH test strip can be genuinely useful: a normal reading with heavy itching leans yeast, an elevated reading leans BV or trichomoniasis.
Yeast infections do inflame the vulva. Redness, swelling, burning when you pee as urine passes over irritated skin, and pain during sex are all common — and all things BV typically doesn't cause.
What triggers yeast overgrowth
- Antibiotics — the most common trigger by far, since they clear the bacterial competition.
- Hormonal shifts: pregnancy, the luteal phase, some hormonal contraception.
- Uncontrolled blood sugar or diabetes.
- A suppressed immune system.
- Prolonged damp heat — sitting in wet swimwear or gym clothes.
The third possibility nobody thinks of
BV accounts for roughly 40–50% of vaginitis cases and yeast around 20–25%. But trichomoniasis — a treatable parasitic STI — accounts for another 15–20%, and it mimics both. Trich can produce a frothy yellow-green discharge with an odour, or produce almost nothing at all.
There's also a category that isn't infection at all: irritant or contact dermatitis from soaps, laundry detergent, scented products or a new lubricant. If you have itching and irritation with no unusual discharge, an infection may not be what's happening. Our guide to vulva care and what your intimate skin actually needs covers that territory in detail.
This is the honest case against confident self-diagnosis. Studies have repeatedly found that women self-diagnosing yeast infections get it right well under half the time — and a large share of them have had a diagnosed yeast infection before.
When to stop guessing and get tested
Treat at home only if you've had a clinician-confirmed yeast infection before and this feels identical. Otherwise, get seen. Definitely book an appointment if:
- This is your first time with these symptoms
- There's a fishy odour — BV needs prescription antibiotics and won't respond to anything on the drugstore shelf
- You have pelvic pain, fever, or bleeding between periods
- You're pregnant — untreated BV is associated with preterm birth
- An OTC antifungal hasn't worked within a few days
- You're getting four or more episodes a year, which warrants looking for an underlying driver
- The discharge is yellow, green or frothy
A clinician can settle it in minutes with a pH check and a microscope slide, and can test for trichomoniasis at the same time.
What actually reduces recurrence
Recurrence is the real frustration with both conditions. More than half of women treated for BV see it return within a year. The habits that help are unglamorous but they work.
Stop washing the inside
The vagina is self-cleaning. Douching is the most consistently identified modifiable risk factor for BV. Warm water on the vulva only — the external skin — is genuinely all that's needed.
Drop the scent
Fragranced washes, wipes, sprays and deodorising products disrupt the microbiome and irritate vulvar skin. "pH-balanced" on a bottle of scented wash does not cancel out the fragrance.
Pay attention to the week of your period
Vaginal pH rises during menstruation, because blood is closer to neutral than your usual acidic baseline. That's the same shift that favours BV — which is why symptoms so often flare during or just after your period. It doesn't mean you need to avoid sex that week, but it's a good week to skip douching, scented products and anything else that adds insult to injury. Our guide to period sex covers what changes during menstruation and how to look after yourself through it.
Check what your lubricant is doing
This one gets overlooked. Many mainstream lubricants are highly hyperosmolar, meaning they draw water out of vaginal cells and damage the epithelial barrier — and some contain glycerin, which a subset of women find contributes to yeast recurrence. Chlorhexidine and parabens are worth avoiding too. If you're prone to either infection, the formula you use during sex is a genuine variable, not a detail. Our guide to choosing a lubricant explains osmolality and pH and what to look for on a label.
A note on our own products, honestly: our CBD Intimate Oil and Hydro Glide Relief Serum are comfort products, not treatments. They will not cure BV or a yeast infection, and nothing sold outside a pharmacy will. What a well-formulated, fragrance-free product can do is avoid making a sensitive vaginal environment worse. Also note that oil-based products degrade latex, so they aren't compatible with latex condoms.
Breathable fabric, and change out of damp clothes
Cotton underwear, no underwear at night, and getting out of wet swimwear promptly all reduce the warm damp conditions Candida prefers.
Consider probiotics — with realistic expectations
Evidence for oral and vaginal Lactobacillus probiotics in reducing BV recurrence is promising but not settled. Some women find them helpful alongside standard treatment. They aren't a substitute for antibiotics when you have an active infection.
Finish the full course
Stopping antibiotics or antifungals as soon as symptoms ease is one of the most reliable ways to guarantee recurrence.
Frequently asked questions
Can you have BV and a yeast infection at the same time?
Yes, and it happens more often than most people expect — sometimes because antibiotics used to treat BV trigger yeast overgrowth. Mixed symptoms (odour and intense itching, or discharge that seems to have both textures) is a strong reason to be examined rather than self-treat.
Is BV a sexually transmitted infection?
No. BV isn't classified as an STI and you can get it without ever having been sexually active. That said, sexual activity — especially with a new partner — measurably changes the vaginal microbiome and raises risk.
Will BV clear up on its own?
Sometimes it does. But it can also persist, recur, and raise your risk of acquiring STIs and of complications in pregnancy. If you have symptoms, treat it rather than wait it out.
Does yogurt or boric acid work?
Eating yogurt isn't a treatment. Boric acid suppositories have real evidence behind them for recurrent yeast infections and as an adjunct in recurrent BV, and some clinicians recommend them — but boric acid is toxic if swallowed and shouldn't be used in pregnancy, so it's a conversation to have with your provider rather than a self-prescription.
Why does the smell get worse after sex?
Semen is alkaline. When it raises vaginal pH, the amine compounds produced by BV bacteria become volatile — which is exactly when you notice them. It's a fairly specific pointer toward BV rather than yeast. The same thing happens around your period, for the same reason.
Does my partner need treatment?
For yeast infections, usually not, unless a male partner has symptoms. For BV, guidance has been shifting: recent research on treating male partners of women with recurrent BV has shown benefit, so it's worth raising with your clinician if BV keeps returning.
Is BV dangerous in pregnancy?
It's worth treating promptly. Untreated BV during pregnancy is associated with preterm birth and low birth weight, and pregnancy hormones also make yeast overgrowth more likely — so vaginitis of both kinds is more common in these nine months. Our guide to sex during pregnancy covers what else changes, and what your provider will and won't clear you for.
The bottom line
Smell means bacteria. Itch means yeast. Neither is a reflection of your hygiene, and the instinct to wash more aggressively makes both more likely rather than less. When it's your first episode, when there's an odour, when you're pregnant, or when it keeps coming back — get an actual diagnosis instead of another box from the pharmacy aisle.
Keep reading
- Vulva Care 101: What Your Intimate Skin Actually Needs
- How to Choose a Lubricant: Water-Based vs Silicone vs Oil-Based
- Period Sex: Is It Safe, Does It Help Cramps, and How to Make It Easier
- Sex During Pregnancy: What's Safe, Trimester by Trimester
This article is for general education and isn't medical advice. Privy Peach products are intended for comfort and pleasure, not to diagnose, treat, cure or prevent any condition. Please speak with a qualified healthcare provider about your symptoms.