BV vs Thrush: How to Tell the Difference
▶ In short — BV vs thrush
The quickest way to tell them apart is odour and itching. BV causes thin, grey-white discharge with a fishy smell and little itching — it's a bacterial imbalance treated with antibiotics. Thrush causes thick, white, cottage-cheese-like discharge with intense itching and soreness but no strong smell — it's a yeast infection treated with antifungals.
Part of the Access Doctor Bacterial Vaginosis guide.
BV vs Thrush: Key Differences
BV and thrush are the two most common causes of a change in vaginal discharge, and they're often confused — but they have different causes and need different treatments. This table is the quickest way to tell them apart:
| Feature | Bacterial Vaginosis (BV) | Thrush (Yeast Infection) |
|---|---|---|
| Cause | Bacterial imbalance — reduced lactobacilli, overgrowth of anaerobic bacteria | Fungal overgrowth — usually Candida albicans |
| Discharge | Thin, watery, grey-white | Thick, white, cottage-cheese-like |
| Odour | Strong fishy smell, especially after sex | Little to no odour |
| Itching | Usually absent or mild | Intense itching — hallmark symptom |
| Soreness | Rarely | Often present |
| Treatment | Antibiotics: metronidazole or clindamycin | Antifungals: fluconazole or topical creams |
| Risk factors | Douching, perfumed products, smoking, multiple partners | Antibiotics, hormonal changes, diabetes, weakened immunity |
Important: BV and thrush need completely different treatments. Treating BV with an antifungal will not work — and vice versa. Get an accurate diagnosis before starting treatment; if unsure, a short online consultation with our GPhC-registered prescribers can clarify it.
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Treat BV Online →What Is Bacterial Vaginosis?
Bacterial vaginosis (BV) is the most common cause of abnormal vaginal discharge in women of reproductive age — the World Health Organization lists it as the leading cause of vaginal discharge globally in this group.
BV is an imbalance in the natural bacterial flora of the vagina. A healthy vagina is dominated by lactobacilli, which keep the environment acidic and inhibit harmful microbes. In BV, protective lactobacilli fall and other bacteria — particularly Gardnerella vaginalis and other anaerobes — overgrow. This produces the characteristic thin, grey-white discharge with a fishy odour, often more noticeable after sex. Around half of women with BV have no symptoms at all.
What Is Thrush (a Yeast Infection)?
Thrush — also called vaginal candidiasis — is a fungal infection, usually caused by Candida albicans, a yeast naturally present in the vagina in small amounts. When the balance is disrupted it can overgrow and cause infection. Typical symptoms are intense itching and irritation of the vagina and vulva, a thick white discharge sometimes described as cottage-cheese-like, soreness and redness. Unlike BV, thrush does not usually cause a fishy odour — which is the key distinguishing feature.
What Causes BV?
The exact mechanism isn't fully understood, but several factors are linked to disrupting the vaginal bacterial balance:
- Douching — washing inside the vagina disrupts protective lactobacilli
- Perfumed soaps, scented washes or vaginal deodorants used in the vaginal area
- New or multiple sexual partners — alters the vaginal environment
- Smoking — associated with reduced vaginal lactobacilli
- Hormonal changes — including those of the menstrual cycle or pregnancy
BV is not an STI and can develop in women who aren't sexually active — but untreated BV can increase susceptibility to certain STIs.
Can You Have Both BV and Thrush at the Same Time?
Yes — you can have both at once. A dual infection can produce overlapping symptoms, which makes accurate diagnosis particularly important. If you think you may have both, a clinical assessment ensures you get the right treatment for each rather than treating only one.
Treatment for Each
Because the causes are different, so are the treatments:
- BV — antibiotics. Metronidazole (tablets or Zidoval vaginal gel) is NICE first-line; Dalacin (clindamycin) cream is the alternative. Avoid alcohol during metronidazole treatment — see metronidazole side effects. For the full comparison, see BV treatment options.
- Thrush — antifungals. Such as fluconazole (oral) or clotrimazole (cream/pessary). An antibiotic will not treat thrush.
Mild BV sometimes settles on its own, but treatment is generally recommended to ease symptoms, reduce complications and prevent recurrence — especially in pregnancy.
Access Doctor provides prescription BV treatment following a short online assessment. No GP referral required.
Get BV Treatment →Frequently Asked Questions
What is the difference between BV and a yeast infection?
BV is a bacterial imbalance producing thin, grey-white discharge with a fishy odour and little itching. Thrush is a Candida fungal infection producing thick, white, cottage-cheese-like discharge with intense itching and soreness but no strong smell. They need different treatments — antibiotics for BV, antifungals for thrush.
How do I know if I have BV or thrush?
The quickest clues are odour and itching: a strong fishy smell with thin grey-white discharge points to BV; intense itching and soreness with thick white discharge and no smell points to thrush. Because they can overlap or occur together, a clinical assessment is the reliable way to be sure before treating.
Can you have BV and thrush at the same time?
Yes — both can occur simultaneously, causing overlapping symptoms. Accurate diagnosis is important so you get the right treatment for each. An online consultation with our prescribers can help clarify it.
What causes bacterial vaginosis?
BV results from an imbalance in vaginal bacteria — reduced lactobacilli and overgrowth of anaerobes such as Gardnerella vaginalis. Risk factors include douching, perfumed products, smoking, new or multiple partners, and hormonal changes. It can also develop without any identifiable cause.
Is BV a sexually transmitted infection?
No — BV is not classified as an STI, though sexual activity can alter the vaginal environment. BV can develop in women who aren't sexually active. Untreated BV can, however, increase susceptibility to certain STIs.
How is BV treated?
BV is treated with antibiotics — metronidazole (tablets or Zidoval gel) is NICE first-line, with Dalacin (clindamycin) cream as an alternative. Thrush, by contrast, is treated with antifungals such as fluconazole or clotrimazole.
References
- BASHH. UK National Guideline for the Management of Bacterial Vaginosis. 2023. bashh.org/guidelines
- NICE. Bacterial vaginosis: Clinical Knowledge Summary. 2023. cks.nice.org.uk/topics/bacterial-vaginosis
- NHS. Bacterial vaginosis. 2023. nhs.uk/conditions/bacterial-vaginosis
- Electronic Medicines Compendium. Metronidazole 400mg tablets: SmPC. 2024. medicines.org.uk/emc/product/981
- Electronic Medicines Compendium. Dalacin Cream 2% w/w: SmPC. 2024. medicines.org.uk/emc/product/4063
Medical disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional for diagnosis and treatment. Metronidazole and Dalacin Cream are prescription-only medicines — a medical consultation is required before they can be dispensed. In a medical emergency, call 999.