Bacterial Vaginosis Symptoms,
Causes, and Treatment

BV symptoms explained including fishy odor, discharge changes, and when you need antibiotics. Get treated online.

What Is Bacterial Vaginosis

Bacterial vaginosis (BV) is the most common vaginal condition in women of reproductive age, affecting an estimated 21 million women in the United States each year. Despite how common it is, BV remains widely misunderstood, and many women mistake it for a yeast infection or dismiss their symptoms entirely.

BV occurs when the natural balance of bacteria in the vagina is disrupted. A healthy vagina contains a mix of bacteria, with beneficial Lactobacillus species making up the majority. These good bacteria produce lactic acid that maintains a slightly acidic environment (pH below 4.5), which keeps harmful bacteria in check. When Lactobacillus populations decline and anaerobic bacteria such as Gardnerella vaginalis overgrow, the vaginal pH rises and BV develops.

It is important to understand that BV is not a sexually transmitted infection, although sexual activity is one of the factors that can disrupt vaginal flora. BV is a dysbiosis -- an imbalance of the vaginal microbiome -- rather than a traditional infection caused by a single invading organism. This distinction matters because it affects both treatment and prevention strategies.

Common BV Symptoms

Many women with BV experience noticeable symptoms, though up to 50 to 75 percent of cases may be asymptomatic. When symptoms are present, they tend to develop gradually and may fluctuate in intensity over time.

The hallmark symptoms of bacterial vaginosis include:

• Fishy vaginal odor: This is the most distinctive BV symptom. The odor is often described as musty or fishy and tends to be strongest after sexual intercourse, during menstruation, or after washing with soap
• Thin, grayish-white discharge: BV discharge is typically watery or milky in consistency, not thick or clumpy. It may coat the vaginal walls evenly
• Increased discharge volume: Many women notice more discharge than usual
• Mild vaginal irritation: Some women experience mild itching or burning, though this is less common with BV than with yeast infections
• Burning during urination: Occasionally reported, particularly if the vulvar area is irritated

Notably, BV does not typically cause significant itching, redness, or swelling of the vulva. If these symptoms are prominent, a yeast infection or another condition may be more likely.

BV vs Yeast Infection: How to Tell the Difference

BV and yeast infections are the two most common causes of abnormal vaginal discharge, and they are frequently confused with each other. However, they have different causes, different symptoms, and require different treatments. Using the wrong over-the-counter product can delay proper care and allow symptoms to worsen.

Key differences to look for:

• Discharge: BV produces thin, grayish-white, watery discharge. Yeast infections produce thick, white, cottage cheese-like discharge that tends to be clumpy
• Odor: BV causes a noticeable fishy smell, especially after intercourse. Yeast infections typically have no odor or a mild bread-like scent
• Itching: Intense vulvar and vaginal itching is a hallmark of yeast infections. BV may cause mild irritation but rarely causes significant itching
• Redness and swelling: Yeast infections commonly cause vulvar redness, swelling, and soreness. These symptoms are uncommon with BV
• Pain during intercourse: More commonly associated with yeast infections than BV

If you are unsure which condition you have, a provider can help. For a more detailed comparison, see our guide on BV vs yeast infection differences. Accurate diagnosis is important because BV requires prescription antibiotics, while yeast infections can often be treated with over-the-counter antifungal medications.

What Causes BV

The exact cause of bacterial vaginosis is not fully understood, but it results from a shift in the vaginal microbiome away from protective Lactobacillus bacteria toward a diverse community of anaerobic organisms. Several factors are known to contribute to this imbalance.

Douching is one of the most well-established risk factors for BV. Vaginal douching washes away beneficial bacteria and disrupts the natural acidic environment, making it easier for harmful bacteria to take hold. Medical guidelines strongly recommend against douching for this reason -- the vagina is self-cleaning and does not require internal washing.

Sexual activity is associated with BV, particularly with new sexual partners or multiple partners. While BV is not classified as a sexually transmitted infection, intercourse can introduce new bacteria and alter vaginal pH. BV can occur in women who have never been sexually active, but it is more common in sexually active women. Other contributing factors include the use of scented soaps, bubble baths, or feminine hygiene sprays in the vaginal area, as well as use of intrauterine devices (IUDs) for contraception.

Risk Factors

While any woman of reproductive age can develop BV, certain factors increase the likelihood. Understanding your risk factors can help you take preventive steps and recognize symptoms earlier.

Established risk factors for bacterial vaginosis include:

• Douching: Even occasional douching significantly increases BV risk
• New or multiple sexual partners: Changes in sexual partners can alter vaginal bacterial communities
• Lack of condom use: Semen has a higher pH that can temporarily disrupt vaginal acidity
• Smoking: Tobacco use has been independently linked to higher rates of BV, possibly through effects on the immune system and vaginal flora
• IUD use: Intrauterine devices may slightly increase BV risk in some women
• African American race: BV is more prevalent among Black women, though the reasons for this disparity are not fully understood and likely involve a combination of biological and environmental factors
• Use of scented products: Perfumed soaps, body washes, laundry detergents, and feminine sprays used in or near the vaginal area
• Antibiotic use: Antibiotics taken for other conditions can reduce protective Lactobacillus populations

Having one or more risk factors does not mean you will definitely develop BV, but awareness allows you to minimize modifiable risks and seek prompt care if symptoms appear.

Treatment Options

Bacterial vaginosis requires prescription antibiotic treatment. Over-the-counter yeast infection medications will not resolve BV and may delay appropriate care. The two most commonly prescribed antibiotics for BV are metronidazole and clindamycin, both of which are available in oral and vaginal formulations.

Metronidazole (Flagyl) is the most frequently prescribed treatment. It can be taken as an oral tablet (500 mg twice daily for 7 days) or applied as a vaginal gel (0.75%, once daily for 5 days). Oral metronidazole should not be combined with alcohol, as this interaction can cause nausea, vomiting, and abdominal cramps. Avoid alcohol during treatment and for at least 72 hours (3 days) after completing the course.

Clindamycin is an alternative option available as a vaginal cream (2%, applied at bedtime for 7 days) or oral capsules. Clindamycin vaginal cream is oil-based and can weaken latex condoms and diaphragms during treatment and for up to 72 hours after completion.

Most women experience symptom improvement within 2 to 3 days of starting treatment, but it is essential to complete the full course of antibiotics even if you feel better. Stopping early increases the risk of recurrence. Your provider at InnoCre Telehealth can determine which treatment option is best for your situation.

Preventing BV Recurrence

One of the most frustrating aspects of BV is its high recurrence rate. Studies show that up to 50 percent of women who are successfully treated for BV will experience a recurrence within 12 months. While there is no guaranteed way to prevent recurrence, several evidence-based strategies can help reduce the risk.

Steps to help prevent BV from coming back:

• Avoid douching: This is the single most important preventive measure. Let the vagina maintain its own natural cleaning process
• Use unscented products: Choose fragrance-free soaps, detergents, and body washes. Avoid feminine sprays, scented tampons, and perfumed panty liners
• Wear breathable underwear: Cotton underwear allows airflow and helps maintain a balanced vaginal environment. Avoid tight-fitting synthetic fabrics
• Practice safe sex: Consistent condom use may help prevent BV recurrence by reducing vaginal pH changes
• Complete all prescribed antibiotics: Finishing the full treatment course reduces the chance of incomplete bacterial clearance
• Consider probiotics: Some research suggests that oral or vaginal probiotics containing Lactobacillus strains may help restore healthy vaginal flora, though evidence is still evolving

If BV recurs frequently, your provider may recommend a longer course of treatment or a suppressive maintenance regimen. Women with recurrent BV benefit from an ongoing relationship with a women's health provider who can adjust their treatment plan as needed.

Getting BV Treatment Online

Bacterial vaginosis is well-suited to telehealth evaluation and treatment. Because BV is diagnosed primarily based on symptoms -- the characteristic discharge, odor, and absence of significant itching or swelling -- a provider can make an accurate clinical assessment through a video visit without an in-person exam in many cases.

During a telehealth visit for BV, your provider will ask about the nature of your discharge, any odor changes, associated symptoms, your medical history, and any prior BV episodes. Based on this evaluation, they can prescribe the appropriate antibiotic and send it directly to your pharmacy. If your symptoms are atypical or your provider suspects another condition, they may recommend lab testing for confirmation.

At InnoCre Telehealth, we understand that discussing vaginal symptoms can feel uncomfortable. Our board-certified providers create a judgment-free environment and treat these concerns with the same professionalism as any other medical condition. Same-day appointments are available for patients in Maryland, Washington, and Delaware, so you can get diagnosed and start treatment without delay.

Frequently Asked Questions