BV vs Yeast Infection: How to Tell the Difference

Noticing a change in your intimate health can bring up a lot of questions, especially when you are not entirely sure what is causing it. If you are experiencing unusual discharge or discomfort, you are likely trying to work out whether you are dealing with bacterial vaginosis (BV) or a yeast infection (commonly known as thrush).

While both conditions are incredibly common and usually harmless, they are caused by completely different types of micro-organisms. Because of this, they require entirely different treatments. BV needs to be treated with targeted antibiotics such as metronidazole, while a yeast infection requires an antifungal medication.

If you are trying to navigate symptoms, this guide will help you identify the differences so you can get the correct treatment with confidence.

What Is The Difference Between BV And A Yeast Infection?

To understand how to treat what you have, it helps to look at what is happening naturally inside your body. Your vagina maintains its own delicate natural balance at a specific, acidic pH level. A shift in this is what triggers both of these conditions, but they head in two very different directions:

• Bacterial Vaginosis (BV): This is a bacterial issue. It occurs when there is an overgrowth of certain types of bacteria that naturally live in the vagina, causing the level of protective, "good" bacteria to drop. For a detailed breakdown of this condition, you can read our guide on what is bacterial vaginosis.

• Yeast Infection (Thrush): This is a fungal issue. It is caused by an overgrowth of a natural yeast (fungus) called Candida albicans, which normally lives harmlessly on your skin and in your body in small amounts.

Because one is bacterial and the other is fungal, the symptoms they produce look, smell, and feel quite distinct.

How Do I Know If I Have BV or Thrush?

While both conditions cause changes to your normal vaginal discharge, you can usually tell the difference by checking three main things: odour, the consistency of the discharge, and whether you have itching or swelling.

Here is a simple breakdown to help you compare bacterial vaginosis vs yeast infection symptoms at a glance:

Can you have BV and thrush at the same time?

Yes, it is possible to have both BV and thrush at the exact same time. While it is not incredibly common, it can happen when the natural environment of the vagina is disrupted enough to allow both bacteria and yeast to multiply together.

If you have both infections simultaneously, your symptoms will likely overlap. You might notice a watery, grey discharge that has a strong fishy smell, but you will also experience the intense itching, redness, and burning that comes with a yeast infection.

If you suspect you have both, a clinical swab test can confirm it. Having both infections together is not dangerous, but it does mean you will need a combination of an antibiotic and an antifungal treatment to clear them both up.

The Link Between Metronidazole and Thrush

If you have BV and plan to treat it, it's important to understand how metronidazole affects the natural vaginal flora. A common question from patients is how the treatment interacts with yeast overgrowth.

Can Metronidazole Cause Thrush?

Yes, developing thrush is a registered side effect of using metronidazole.

This is because, as the antibiotic kills harmful bacteria causing BV, it also wipes out some of the ‘good’ bacteria that keeps vaginal yeast levels under control. With fever good bacteria, natural yeasts multiply, leading to a thrush infection;.

Can Metronidazole Cause Oral Thrush?

Yes. While it is much less common than vaginal thrush, taking oral metronidazole tablets can alter the balance of microbes inside your mouth, causing oral thrush. If the good bacteria in your mouth are reduced, yeast can overgrow, causing white raised patches on your tongue, throat, or the inside of your cheeks, or soreness.

Does Metronidazole Treat Thrush?

No, metronidazole does not treat thrush.

As an antibiotic, metronidazole is designed to target and kill bacteria. Thrush is a fungal infection caused by yeast, not a bacteria, therefore metronidazole will have no effect on it.

Additionally, taking an antibiotic specifically for thrush can cause more harm than good, as it wipes out more of the good bacteria which keep yeast levels at bay.

Thrush must always be treated with dedicated antifungal treatments, such as fluconazole capsules or clotrimazole creams.

What Causes These Infections?

Both infections are caused by an upset in the vagina's natural pH and microbial balance, but they can be triggered by slightly different lifestyle factors.

Common Triggers For BV Include:

• Using perfumed soaps, bubble baths, shower gels, or vaginal deodorants.

• Vaginal douching (washing inside the vagina with water or specialized products).

• A change in sexual partners, or having multiple partners (though BV is not an STI)

• Smoking.

Common Triggers For A Yeast Infection Include:

• Taking a course of antibiotics.

• Hormonal changes (such as during pregnancy or your menstrual cycle).

• Skin irritation from tight clothing or synthetic underwear.

• A weakened immune system.

How To Manage And Prevent Both Infections

Maintaining a healthy vaginal balance is the best way to prevent both BV and thrush from returning. You can protect your natural balance by following these simple tips:

• Wash with water only: Avoid scented soaps, shower gels, or feminine washes around your intimate area. Plain water is all your body needs to stay clean.

• Avoid douching completely: The vagina is self-cleaning. Douching flushes away the good, protective bacteria and heavily increases your risk of developing BV.

• Choose breathable clothing: Wear loose-fitting clothes and breathable cotton underwear to prevent moisture from building up, as yeast thrives in warm, damp environments.

• Dry thoroughly: Make sure to gently but thoroughly dry your intimate area after a bath or shower before getting dressed.

Getting the Right Treatment at QuickMeds

As treatments for BV and yeast infections are completely different, getting an accurate diagnosis is essential for finding relief.

If your symptoms point toward bacterial vaginosis, you can safely access trusted antibiotic treatments through our regulated online clinic. We offer a full range of standard prescription options tailored to your preference, including oral metronidazole tablets, localised metronidazole gel, and clindamycin vaginal cream.

You can buy treatment online through our GPhC-registered online pharmacy. Simply fill out a quick online questionnaire- this will ask about your symptoms, your medical history, and if you take any other medication.

Our pharmacist prescribers will review your details to ensure the medication is safe for you, allowing you to treat your infection quickly, discreetly, and comfortably.