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Do I Have Cystitis, Bacterial Vaginosis (BV) or Thrush?

Thick white discharge and intense itching usually point to thrush. Thin grey discharge with a fishy smell usually points to BV. Burning when you urinate, with no discharge, usually points to cystitis. The table compares all three side by side; you can have more than one condition at once.

9 min read time

Written by: Sunny Dhain

Medically reviewed by: Tannaz Sohrabi

Published 06/02/2026 Updated 06/08/2026

Vaginal and urinary symptoms are uncomfortable at the best of times, and these three are easy to mix up because they overlap. Bacterial vaginosis (BV), thrush and cystitis have different causes and different treatments, so working out which one you have helps you get the right treatment first time and avoid taking something you don’t need. Here’s how to tell them apart, whether you can have more than one together, and how to treat each.

Cystitis vs BV vs thrush: the differences at a glance

The quickest way to narrow things down is to look at your discharge, any smell, whether you’re itchy, and what happens when you urinate.

	Cystitis/ Urinary Tract Infection	Bacterial vaginosis (BV)	Thrush
Area affected	Bladder and urinary tract	Vagina	Genital area (internal/external)
Discharge	None (it’s not a vaginal condition)	Thin, greyish-white and watery	Thick, white and cottage-cheese-like
Smell	Urine may smell strong; no vaginal odour	Strong and fishy, often worse after sex	Usually none, sometimes mild and yeasty
Itching	None	None	Intense itching, soreness and redness
Weeing	Burning or stinging, plus going often and urgently	Not usual	Possible stinging as urine passes irritated skin
Main cause	Bacteria in the urinary tract	An imbalance of vaginal bacteria	An overgrowth of Candida (a yeast)
Treatment	Self-care and/or antibiotics	Antibiotics (tablets or gel)	Antifungal cream, pessary or capsule

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How to tell which one you have

If you’re trying to work it out quickly, start with your main symptom:

Burning or stinging when you wee, needing to go often and urgently, and no unusual discharge? This is most likely cystitis, a urinary (bladder) infection. Some people call it a UTI or a “water infection”.

Thin, greyish discharge with a noticeable fishy smell, but little or no itching? This points towards BV.

Thick, white, cottage-cheese-like discharge with intense itching and soreness? This points towards thrush.

These are guides, not a diagnosis. Symptoms overlap, and it’s possible to have more than one at the same time, so if you’re unsure or things aren’t improving, get checked.

Does thrush smell?

Smell is one of the most useful clues because it reliably distinguishes BV from thrush.

BV usually has a strong, fishy smell that’s commonly more noticeable after sex, and that odour is one of its main features.

Thrush is the opposite; it doesn’t usually smell of much, and when it does, the odour is mild or slightly yeasty, with the itching and thick white discharge being the real giveaways.

Cystitis doesn’t cause a vaginal smell at all, though your urine itself may smell stronger or look cloudy.

So a clear fishy smell is usually BV, while acute itching with no real smell tends to be thrush.

What does the discharge look like?

Discharge is the other big giveaway, and the three are quite distinct:

Thrush: thick, white and cottage-cheese-like, usually with no strong smell.

BV: thin, greyish-white and watery, with that fishy odour.

Cystitis: no vaginal discharge at all, because it affects the bladder, not the vagina.

It’s worth knowing that you can have thrush with only mild discharge, or none, so don’t rule it out on discharge alone if the itching is there.

A closer look at each condition

Bacterial vaginosis (BV)

BV is one of the most common vaginal infections. It happens when the natural balance of bacteria in the vagina is disrupted, letting certain bacteria multiply. The main signs are a thin greyish-white discharge and a fishy smell, though many people get little or no irritation. BV doesn’t always clear on its own and can raise the risk of other infections, so it’s best not to leave it untreated.

Thrush

Thrush is a fungal infection caused by Candida, a yeast that lives naturally in the body and is usually harmless until it overgrows. The classic signs are thick white discharge and intense itching, often with soreness, redness, and stinging when you wee or discomfort during sex. Antibiotics, pregnancy, hormonal changes, stress or diabetes can trigger it. Because of those triggers, you may sometimes be asked to speak to a clinician to check nothing else is going on.

Cystitis

Cystitis is a type of urinary tract infection (UTI) that affects the bladder rather than the vagina, which is why people often search for it as a “UTI” or “water infection”. It doesn’t cause discharge or itching. Instead, you get burning when you wee, needing to go often and urgently, lower tummy ache, and cloudy or strong-smelling urine. It’s usually caused by bacteria entering the urinary tract and often needs antibiotics.

Can you have BV, thrush or cystitis at the same time?

Yes. Because BV and thrush both affect the vagina while cystitis affects the bladder, you can have more than one at once, and the combinations people ask about are all possible. Having BV and thrush together does happen, though it isn’t that common, and the overlapping symptoms make it harder to tell what’s going on. You can also have thrush or BV alongside cystitis, since a vaginal infection and a bladder infection are two separate things.

When symptoms overlap like this, a clinician can review them and, if needed, arrange a swab or urine test. If you do turn out to have more than one, treatment can cover both. And if you’ve treated one but things haven’t settled, it’s a good idea to check whether something else is going on too.

How each one is treated

Each condition has its own treatment, because each has a different cause:

Thrush is treated with antifungal medication, such as a cream, a pessary or an oral capsule. You can shop thrush treatment.

BV is usually treated with antibiotics, either as tablets or a vaginal gel, available through our bacterial vaginosis treatment page.

Cystitis is treated with self-care and, where needed, a short course of antibiotics. Women aged 16–64 can get free treatment through NHS Pharmacy First, or use our private cystitis consultation.

When to see a clinician

Get advice from a clinician instead of self-treating if it’s your first episode, if symptoms keep coming back, if you’re pregnant, or if you’ve treated it and things aren’t improving.

See a GP promptly if you notice blood in your urine, and get urgent help for signs of a kidney infection, such as a high temperature, chills, or pain in your back or side.

Get the right treatment today

Frequently Asked Questions

Does thrush smell?

Usually the smell is not strong. Thrush tends to have little or no smell, or at most a mild yeasty one, and its main signs are intense itching and thick white discharge. A strong fishy smell points more towards BV than thrush.

What does thrush discharge look like?

Thrush discharge is typically thick, white and cottage-cheese-like, usually without a strong smell. By contrast, BV discharge is thin, greyish and watery with a fishy odour. You can have thrush with only mild discharge, so don’t rule it out if the itching is there.

How do I know if it's BV or thrush?

The quickest test is smell and itch. A fishy smell with thin grey discharge and little itching suggests BV. Intense itching with thick white discharge and no real smell suggests thrush. If you’re not sure, or you might have both, get checked before treating.

Do I have thrush or cystitis (or a UTI)?

Drinking plenty of water and peeing often and fully help flush bacteria from your urinary tract, while pain relief and heat ease discomfort. There’s no good evidence that cranberry products or cystitis sachets treat an infection once it has started, so don’t rely on them if symptoms are worsening.

Can you have thrush and cystitis, or BV and thrush, at the same time?

It can. Cystitis that persists for weeks, keeps returning, or doesn’t respond to antibiotics may point to a recurrent infection, interstitial cystitis, or another underlying cause. See a GP for tests and a longer-term plan.

Can I get treatment without seeing a GP?

Not quite. A UTI is any infection in the urinary tract; cystitis is specifically a bladder infection, so it’s one kind of lower UTI. All cystitis is a UTI, but not all UTIs are cystitis.

How we reviewed this article:

Sources

Thrush in men and women — symptoms, causes and treatment (2026) NHS [accessed 5th August 2026]
Bacterial vaginosis — symptoms, causes and treatment (2026) NHS Inform [accessed 5th August 2026]
Thrush — symptoms, triggers and treatment (2026) NHS Inform [accessed 5th August 2026]

Current version
6th Aug 2026 Edited by: Sunny Dhain, MPharmRS PGDip IndP
6th Aug 2026 Medically reviewed by: Tannaz Sohrabi

Medically reviewed by:

Tannaz Sohrabi

Tannaz is Governance Pharmacist at The Family Chemist, where she leads the clinical governance and safety standards of the pharmacy and online clinic. With extensive experience across both hospital and community pharmacy, she brings a strong clinical background and a deep understanding of patient care to the service.

Last reviewed: 6th Aug 2026

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Do I Have Cystitis, Bacterial Vaginosis (BV) or Thrush?

Content

Cystitis vs BV vs thrush: the differences at a glance

How to tell which one you have

Does thrush smell?

What does the discharge look like?