Bacterial Vaginosis (BV): Symptoms, Causes, Treatment & Prevention

Bacterial vaginosis (BV) is one of the most common vaginal conditions among women of reproductive age, occurring when the natural balance of bacteria in the vagina is disrupted. While BV is not always considered a serious condition, it can cause uncomfortable symptoms such as unusual vaginal discharge and a strong fishy odor, and in some cases may increase the risk of other health complications if left untreated. Understanding the symptoms, causes, treatment options, and prevention strategies can help you recognize BV early and seek appropriate care. In this guide, you'll learn how bacterial vaginosis develops, how it differs from other vaginal infections, and when it's time to consult a healthcare provider.

What Is Bacterial Vaginosis (BV)?

Bacterial vaginosis (BV) is a common vaginal condition caused by an imbalance in the vagina's natural bacteria. It occurs when harmful bacteria grow in greater numbers than protective bacteria, disrupting the vaginal microbiome. BV is not always sexually transmitted, but it can lead to symptoms such as unusual discharge, a fishy odor, and irritation.

How Does BV Develop?

The vagina naturally contains a diverse community of bacteria, known as the vaginal microbiome, that helps maintain a healthy environment. Among these microorganisms, Lactobacillus bacteria play a key role by producing lactic acid, which keeps the vaginal pH slightly acidic and prevents the overgrowth of harmful bacteria.

Bacterial vaginosis develops when the number of protective Lactobacillus bacteria decreases, allowing other bacteria, such as Gardnerella vaginalis and several anaerobic species, to multiply. This shift changes the vaginal pH and disrupts the natural balance of the vaginal environment, leading to BV.

Although researchers do not fully understand why this imbalance occurs in every case, factors such as sexual activity, vaginal douching, smoking, hormonal changes, and certain contraceptive methods may increase the likelihood of developing BV. However, some women develop bacterial vaginosis without any obvious risk factors.

Is BV a Vaginal Infection?

Yes, bacterial vaginosis is considered a vaginal infection, but it differs from many other types of vaginal infections. Unlike yeast infections, which are caused by an overgrowth of fungi, or sexually transmitted infections (STIs), which result from specific infectious organisms passed between partners, BV occurs because the naturally occurring bacteria in the vagina become unbalanced.

This distinction is important because the underlying cause determines the most appropriate treatment. Antibiotics are commonly used to restore the bacterial balance in BV, while antifungal medications are required for yeast infections and different therapies are used for STIs. Because the symptoms of these conditions can overlap, an accurate diagnosis by a healthcare provider is recommended before starting treatment.

Read more: Vaginal Yeast Infection: Symptoms, Causes & Treatment

BV Symptoms

The symptoms of bacterial vaginosis can range from noticeable discomfort to no symptoms at all. While some women experience the classic signs of BV, others may only discover the condition during a routine pelvic examination. Recognizing the symptoms early can help reduce the risk of complications and ensure timely treatment.

Common Symptoms of Bacterial Vaginosis

The most common symptoms of bacterial vaginosis include:

• A strong fishy vaginal odor, which may become more noticeable after sexual intercourse.
• Thin vaginal discharge that is usually gray, white, or off-white in color.
• An increase in the amount of vaginal discharge.
• Mild vaginal irritation or discomfort.
• A burning sensation during urination in some cases.

Unlike yeast infections, bacterial vaginosis usually does not cause intense itching or thick, cottage cheese-like discharge. If these symptoms are present, another vaginal condition may be responsible.

Can You Have BV Without Symptoms?

Yes. Many women with bacterial vaginosis have no noticeable symptoms. In fact, some cases are identified only during routine gynecological examinations or testing performed for another reason.

Even without symptoms, the bacterial imbalance remains present and, in some situations, may increase the risk of pregnancy-related complications or make a person more susceptible to certain sexually transmitted infections. If you have persistent changes in vaginal discharge, recurrent vaginal infections, or concerns about your vaginal health, it is advisable to seek medical evaluation rather than waiting for symptoms to worsen.

Symptoms That May Indicate Another Vaginal Infection

Although bacterial vaginosis shares some symptoms with other vaginal conditions, certain signs may suggest a different diagnosis.

Symptoms that are less typical of BV include:

• Thick, white, cottage cheese-like discharge.
• Intense vaginal itching.
• Painful sores or blisters around the genital area.
• Significant pelvic pain.
• Fever or flu-like symptoms.

These symptoms may be associated with conditions such as a yeast infection, a sexually transmitted infection (STI), or another type of vaginal infection. Because the treatments differ depending on the underlying cause, seeking an accurate diagnosis is the safest approach before using any medication.

Bacterial Vaginosis Causes

Bacterial vaginosis develops when the natural balance of bacteria in the vagina is disrupted. In a healthy vagina, Lactobacillus bacteria help maintain an acidic environment that limits the growth of other microorganisms. When these protective bacteria decrease, other bacteria can multiply, leading to bacterial vaginosis. Although the exact trigger is not always clear, researchers have identified several factors that may increase the risk of developing BV.

What Causes the Bacterial Imbalance?

The vagina naturally contains both beneficial and potentially harmful bacteria that coexist in balance. Lactobacillus species produce lactic acid and hydrogen peroxide, helping maintain a vaginal pH of around 3.8 to 4.5. This acidic environment prevents excessive bacterial growth.

When the number of Lactobacillus bacteria decreases, anaerobic bacteria, such as Gardnerella vaginalis and related species, can become more abundant. As the vaginal pH rises, these bacteria multiply more easily, resulting in bacterial vaginosis.

While experts continue to study the exact biological mechanisms behind BV, lifestyle habits, hormonal fluctuations, and changes in the vaginal environment are believed to contribute to this imbalance.

Risk Factors for BV

Although bacterial vaginosis can occur in anyone with a vagina, certain factors are associated with a higher likelihood of developing the condition.

Common risk factors include:

• Having a new sexual partner.
• Having multiple sexual partners.
• Vaginal douching, which disrupts the normal vaginal microbiome.
• Smoking, which may affect the growth of beneficial bacteria.
• Using an intrauterine device (IUD) in some individuals.
• Pregnancy, due to hormonal and physiological changes.
• Recent use of antibiotics, which may alter the balance of vaginal bacteria.
• Hormonal changes, including those related to menstruation or menopause.

Having one or more of these risk factors does not necessarily mean you will develop BV, and many women diagnosed with bacterial vaginosis have no identifiable risk factors.

Is BV a Sexually Transmitted Infection (STI)?

No. Bacterial vaginosis is not considered a sexually transmitted infection (STI). Instead, it is caused by an imbalance of naturally occurring bacteria in the vagina.

However, sexual activity can influence the vaginal microbiome and may increase the likelihood of developing BV. Women with a new sexual partner or multiple partners have a higher risk of experiencing bacterial imbalance, but BV can also occur in women who are not sexually active.

Although BV itself is not classified as an STI, untreated bacterial vaginosis may increase susceptibility to certain sexually transmitted infections, including HIV, chlamydia, and gonorrhea. This is one reason why timely diagnosis and appropriate treatment are important.

Bacterial Vaginosis vs. Other Vaginal Infections

Several vaginal conditions share similar symptoms, making it difficult to identify the underlying cause based on symptoms alone. Comparing bacterial vaginosis with other common infections can help you understand the differences, but only a healthcare provider can make a definitive diagnosis.

BV vs. Yeast Infection

Although both conditions can cause vaginal discomfort, they have different causes and typically present with different symptoms.

BV vs. Urinary Tract Infection (UTI)

BV and urinary tract infections may both cause discomfort during urination, but they affect different parts of the body.

Read more: Can a UTI Go Away on Its Own?

BV vs. Sexually Transmitted Infections

Some sexually transmitted infections can cause abnormal vaginal discharge, irritation, or discomfort that resembles bacterial vaginosis. However, STIs are caused by infectious organisms transmitted through sexual contact, while BV results from an imbalance in naturally occurring vaginal bacteria.

Because symptoms can overlap, laboratory testing is often necessary to determine the correct diagnosis and ensure appropriate treatment.

How Is Bacterial Vaginosis Diagnosed?

Bacterial vaginosis cannot always be diagnosed based on symptoms alone. Since BV shares features with yeast infections and sexually transmitted infections, healthcare providers use a combination of medical history, physical examination, and laboratory testing to confirm the diagnosis.

Medical History and Pelvic Exam

Your healthcare provider will begin by asking about your symptoms, including changes in vaginal discharge, odor, itching, or discomfort. They may also ask about recent antibiotic use, sexual activity, pregnancy, contraceptive methods, and previous episodes of bacterial vaginosis.

A pelvic examination allows the provider to assess the appearance of the vaginal discharge and identify signs that may suggest BV or another vaginal condition.

Vaginal Fluid Testing

If bacterial vaginosis is suspected, a sample of vaginal fluid may be collected for further evaluation. Common diagnostic tests include:

• Vaginal pH testing: BV often causes the vaginal pH to rise above 4.5.
• Whiff test: A potassium hydroxide solution is added to the sample. A strong fishy odor supports the diagnosis of BV.
• Microscopy: The sample is examined under a microscope to identify clue cells, which are characteristic of bacterial vaginosis.
• Nugent Score: A laboratory scoring system that evaluates the types and quantities of vaginal bacteria present. It is considered one of the most reliable methods for confirming BV.

Using several diagnostic methods together improves accuracy and helps distinguish bacterial vaginosis from other vaginal infections.

Can BV Be Diagnosed at Home?

Home testing kits that measure vaginal pH are available and may suggest whether the vaginal environment is abnormal. However, an elevated vaginal pH does not always mean bacterial vaginosis is present, and a normal result does not completely rule it out.

Because several conditions can cause similar symptoms, home tests should not replace a professional medical evaluation. If you experience persistent vaginal odor, unusual discharge, recurring symptoms, or symptoms during pregnancy, consulting a healthcare provider is the most reliable way to receive an accurate diagnosis and appropriate treatment.

Bacterial Vaginosis Treatment

Bacterial vaginosis is usually treated with prescription antibiotics that help restore the natural balance of bacteria in the vagina. Treatment is recommended for women with symptoms and may also be advised in certain situations, such as during pregnancy or before specific gynecological procedures. Completing the full course of medication is important, even if symptoms improve within a few days, to reduce the risk of recurrence.

Antibiotics for BV

Several antibiotics are effective for treating bacterial vaginosis. The most appropriate option depends on your symptoms, medical history, pregnancy status, and your healthcare provider's recommendation.

Common antibiotics used to treat BV include:

• Metronidazole: The most commonly prescribed treatment, available as oral tablets or a vaginal gel. It is highly effective for most uncomplicated cases.
• Clindamycin: Available as oral medication or vaginal cream. It may be recommended for individuals who cannot tolerate metronidazole or when another treatment approach is preferred.
• Tinidazole: An alternative oral antibiotic that may be prescribed for certain patients, particularly if symptoms recur or side effects occur with other medications.

Although symptoms often improve within a few days, it is important to finish the entire course of antibiotics to maximize treatment success. Stopping treatment early may increase the likelihood of persistent or recurrent bacterial imbalance.

Note: Antibiotics should only be used under the guidance of a healthcare provider. Self-treating recurrent vaginal symptoms without a confirmed diagnosis may delay appropriate care if another condition is responsible.

How Long Does BV Treatment Take?

Most cases of bacterial vaginosis improve within 2 to 3 days after starting antibiotics, but a complete treatment course typically lasts 5 to 7 days, depending on the medication prescribed.

Even if symptoms disappear quickly, the bacterial balance may not yet be fully restored. Completing the prescribed treatment helps reduce the chance of recurrence.

If symptoms persist after finishing antibiotics or return within a few weeks, follow up with your healthcare provider. Additional evaluation may be needed to confirm the diagnosis or determine whether another condition is present.

Can BV Go Away Without Treatment?

In some cases, bacterial vaginosis may resolve without treatment, particularly if symptoms are mild. However, waiting for BV to go away on its own is generally not recommended, especially when symptoms are bothersome, recur frequently, or occur during pregnancy.

Untreated BV may increase the risk of complications such as pelvic inflammatory disease (PID), pregnancy-related complications, and greater susceptibility to certain sexually transmitted infections.

If you notice persistent vaginal odor, abnormal discharge, or recurring symptoms, seeking medical advice is the safest way to receive an accurate diagnosis and appropriate treatment.

Recurrent BV: Why Does It Keep Coming Back?

Recurring bacterial vaginosis is common. Studies suggest that many women experience another episode within several months of completing treatment. A recurrence does not necessarily mean the initial treatment failed, it often reflects the difficulty of restoring and maintaining a healthy vaginal microbiome.

Understanding why BV returns can help you and your healthcare provider develop a plan to reduce future episodes.

Common Reasons for Recurrence

Several factors may contribute to recurrent bacterial vaginosis, including:

• The vaginal microbiome has not fully returned to its normal balance after treatment.
• Protective Lactobacillus bacteria remain at low levels.
• Ongoing vaginal douching or use of scented intimate hygiene products.
• A new sexual partner or changes in sexual activity.
• Smoking, which may affect the vaginal bacterial environment.
• Not completing the full course of prescribed antibiotics.
• Individual biological factors that make some women more prone to recurrence.

Because recurrent BV can have multiple underlying causes, repeated self-treatment without medical evaluation is not recommended.

How to Reduce the Risk of Recurrence

Although there is no guaranteed way to prevent BV from returning, the following habits may help lower the risk:

• Complete every prescribed antibiotic course exactly as directed.
• Avoid vaginal douching and scented feminine hygiene products.
• Use mild, fragrance-free products around the genital area.
• Practice safer sex and consider using condoms if recommended by your healthcare provider.
• Schedule follow-up care if symptoms return shortly after treatment.
• Seek medical evaluation for recurrent episodes rather than repeatedly using over-the-counter products.

If bacterial vaginosis continues to recur, your healthcare provider may recommend additional testing or a longer-term management plan based on your individual circumstances.

Preventing Bacterial Vaginosis

Although bacterial vaginosis cannot always be prevented, maintaining a healthy vaginal environment can reduce the likelihood of developing bacterial imbalance. Prevention focuses on supporting the natural vaginal microbiome rather than eliminating bacteria altogether.

Healthy Vaginal Habits

Simple daily habits can help maintain normal vaginal health:

• Avoid vaginal douching, which disrupts the natural balance of bacteria.
• Wash the external genital area gently with warm water or a mild, fragrance-free cleanser.
• Avoid scented sprays, powders, and perfumed hygiene products around the vagina.
• Wear breathable cotton underwear and change out of wet clothing promptly.
• Avoid unnecessary use of antibiotics unless prescribed by a healthcare provider.

These practices help preserve the protective bacteria that naturally support vaginal health.

Sexual Health Practices

While bacterial vaginosis is not classified as a sexually transmitted infection, sexual activity can influence the vaginal microbiome.

To help reduce the risk of BV:

• Consider using condoms, particularly with a new sexual partner.
• Limit practices that may disrupt the vaginal environment.
• Discuss recurrent BV with your healthcare provider if symptoms frequently occur after sexual activity.
• Attend routine sexual health checkups when appropriate.

Maintaining open communication with your healthcare provider can help identify individual risk factors and recommend preventive strategies tailored to your needs.

Lifestyle Changes That May Help

Certain lifestyle choices may contribute to long-term vaginal health and lower the risk of bacterial imbalance.

Helpful strategies include:

• Stop smoking if you currently smoke.
• Eat a balanced diet that supports overall health.
• Manage chronic conditions, such as diabetes, under medical supervision.
• Prioritize adequate sleep and stress management to support immune function.
• Seek prompt medical evaluation for persistent or recurring vaginal symptoms.

Although ongoing research continues to explore the role of probiotics and other preventive approaches, current evidence is mixed. They should not replace evidence-based medical treatment, and any supplements should be discussed with a healthcare provider before use.

Possible Complications of Untreated BV

Although bacterial vaginosis is often mild and easily treated, leaving it untreated may increase the risk of certain health complications. Not everyone with BV will experience these problems, but prompt diagnosis and treatment can help reduce the likelihood of more serious conditions, particularly for pregnant individuals or those with recurrent infections.

BV During Pregnancy

Bacterial vaginosis during pregnancy deserves special attention because it has been associated with an increased risk of certain pregnancy complications. Research suggests that untreated BV may be linked to preterm birth, premature rupture of membranes (PROM), and delivering a baby with a low birth weight.

However, not every pregnant woman with BV will develop complications. If you are pregnant and experience symptoms such as unusual vaginal discharge or a persistent fishy odor, it is important to contact your healthcare provider promptly. Early diagnosis and appropriate treatment can help support a healthier pregnancy.

Increased Risk of Other Infections

When the natural vaginal microbiome is disrupted, the body's ability to protect against harmful microorganisms may be reduced.

Studies have shown that untreated bacterial vaginosis may increase susceptibility to certain sexually transmitted infections (STIs), including chlamydia, gonorrhea, herpes simplex virus (HSV), and HIV. BV may also increase the risk of developing infections after certain gynecological procedures.

Treating bacterial vaginosis helps restore the natural bacterial balance and may reduce these associated risks.

Pelvic Inflammatory Disease (PID)

In some cases, untreated bacterial vaginosis may contribute to the development of pelvic inflammatory disease (PID), particularly if harmful bacteria spread from the vagina to the upper reproductive tract.

PID is a serious condition that can affect the uterus, fallopian tubes, and ovaries. Without timely treatment, it may lead to chronic pelvic pain, infertility, or an increased risk of ectopic pregnancy.

Although BV does not always lead to PID, persistent symptoms should never be ignored, especially if they are accompanied by pelvic pain, fever, or abnormal bleeding.

When Should You See a Healthcare Provider?

Many vaginal symptoms can have similar causes, making it difficult to know whether bacterial vaginosis or another condition is responsible. Seeking medical advice can help ensure an accurate diagnosis and the most appropriate treatment.

Warning Signs That Need Medical Attention

You should schedule a medical evaluation and speak with a licensed healthcare provider if you experience:

• A strong or persistent fishy vaginal odor.
• Unusual gray, white, or increased vaginal discharge.
• Vaginal symptoms that are new or worsening.
• Burning during urination that does not improve.
• Pelvic pain, fever, or abnormal vaginal bleeding.
• Vaginal symptoms during pregnancy.
• Symptoms after having a new sexual partner or possible exposure to an STI.

Prompt assessment helps distinguish bacterial vaginosis from yeast infections, urinary tract infections, sexually transmitted infections, and other gynecological conditions.

When Symptoms Return After Treatment

It is not uncommon for bacterial vaginosis to recur after treatment. If your symptoms return within a few weeks or continue despite completing your prescribed antibiotics, it is important to consult your healthcare provider rather than restarting treatment on your own.

A follow-up evaluation can help determine whether:

• The infection has recurred.
• Another vaginal condition is causing similar symptoms.
• Additional testing is needed.
• A different treatment approach or longer management plan may be appropriate.

Recurring symptoms should always be evaluated by a healthcare professional to ensure you receive the correct diagnosis and care.

How Avee Health Can Help

If you're experiencing symptoms of bacterial vaginosis, getting timely medical advice can help you receive the right diagnosis and treatment while avoiding unnecessary complications. Avee Health provides convenient virtual healthcare services for residents of British Columbia, making it easier to access care without visiting a clinic for an initial assessment.

Virtual Medical Care for Vaginal Health Concerns

Through Avee Health's secure telehealth platform, you can speak with a licensed healthcare provider about symptoms such as unusual vaginal discharge, fishy odor, irritation, or recurrent vaginal infections. Your provider can review your symptoms, discuss your medical history, assess possible causes, and recommend the next steps for diagnosis or treatment.

Lab Requisitions When Testing Is Needed

Because bacterial vaginosis cannot always be confirmed based on symptoms alone, laboratory testing may sometimes be recommended. When appropriate, an Avee Health provider can issue a lab requisition, allowing you to complete the necessary tests at a participating laboratory in British Columbia. Test results are then reviewed as part of your ongoing care to help ensure an accurate diagnosis.

For more trusted health information, practical wellness tips, and evidence-based medical articles, be sure to explore the Avee Health Blog, where you'll find resources designed to help you make informed decisions about your health and stay up to date on a wide range of medical topics.

Conclusion

Bacterial vaginosis (BV) is a common vaginal condition that develops when the natural balance of bacteria in the vagina is disrupted. Although it is usually easy to treat with the right medical care, ignoring persistent symptoms can increase the risk of complications and recurrent infections. Recognizing the signs early, obtaining an accurate diagnosis, and completing the recommended treatment are the best steps toward restoring vaginal health.

If you're experiencing unusual vaginal symptoms or recurrent episodes of BV, seeking professional medical advice is essential. Through Avee Health, residents of British Columbia can access convenient virtual medical care, receive personalized guidance, and obtain laboratory requisitions when appropriate all from the comfort of home.