Vaginal itching, burning, and an unusual discharge can be alarming. You might wonder if it is a yeast infection or bacterial vaginosis (BV). These are the two most common causes of abnormal vaginal symptoms, and while they share some overlap, they are different conditions with different treatments. The quickest way to tell them apart is the smell: BV typically causes a fishy odor, while a yeast infection usually does not. However, relying on smell alone is risky, as symptoms can vary. The only way to be certain is to have a healthcare provider take a sample of the discharge and test it.
What Are the Main Differences in Discharge?
The appearance and texture of your discharge offer the strongest visual clues. A yeast infection usually produces a thick, white discharge that looks like cottage cheese. It is often odorless or has only a mild, bread-like smell. In contrast, BV produces a thin, watery discharge that is white or gray. The defining feature of BV discharge is a strong, fishy odor, which often becomes more noticeable after sex or during your period.
Pay attention to the amount as well. A yeast infection may not increase the volume of discharge much, but it changes the texture significantly. BV often increases the overall amount of discharge, leaving you feeling wetter than usual. Neither condition typically causes bloody or brown discharge. If you see blood or a brownish tint, that points to a different issue, such as an infection of the cervix or a hormonal problem, and you should see a doctor.
How Do the Symptoms of Itching and Burning Compare?
Itching is the hallmark of a yeast infection. The itching can range from mild irritation to intense, relentless itching that disrupts sleep. You may also notice redness and swelling of the vulva. Burning is common too, especially when urine touches the irritated skin. This burning is often felt on the outside, on the skin itself, rather than deep inside the vagina.
BV, on the other hand, rarely causes significant itching. The primary complaints are the discharge and the odor. Some women with BV report a mild burning sensation, but it is usually less intense than the burning from a yeast infection. If your main symptom is severe itching with no odor, a yeast infection is more likely. If your main symptom is a fishy smell with little to no itching, BV is more likely.
What Causes Each Condition?
Both conditions involve an imbalance in the vagina’s natural ecosystem, but they are opposite problems. A yeast infection happens when the fungus Candida overgrows. This fungus normally lives in the vagina in small numbers. Antibiotics, high estrogen levels from pregnancy or hormone therapy, and uncontrolled diabetes can all trigger this overgrowth. The immune system usually keeps Candida in check, but when that balance shifts, the fungus multiplies and causes symptoms.
Bacterial vaginosis is not an infection from an outside germ. It is a shift in the bacterial population. The vagina normally contains high levels of Lactobacillus bacteria, which produce lactic acid and keep the environment acidic. In BV, the Lactobacillus levels drop, and other bacteria, like Gardnerella, multiply rapidly. This causes the pH to rise and produces the characteristic fishy odor. Douching and having a new sexual partner are strongly associated with developing BV.
How To Tell If You Have Bv Or A Yeast Infection: The Home Test
You can do a simple check at home using an over-the-counter pH test. Normal vaginal pH is between 3.8 and 4.5. A yeast infection usually keeps the pH in this normal range. BV, however, raises the pH above 4.5. These tests are available at most drugstores without a prescription.
To use the test, you touch a small strip of paper to the vaginal wall and compare the color change to the chart. If the pH is above 4.5, BV is likely. If the pH is normal, a yeast infection is more likely. This test is helpful but not perfect. Some women with BV have a normal pH, and some women with a different infection, like trichomoniasis, also have a high pH. Treat it as a strong clue, not a final answer.
Why Self-Treatment Can Backfire
Using over-the-counter yeast infection creams when you actually have BV will not help. The antifungal medication in those creams targets Candida fungus, not the bacteria involved in BV. You will continue to have symptoms, and the real condition will go untreated. Worse, if you have a different infection entirely, like trichomoniasis, treating for yeast will delay proper treatment.
There is also the risk of using antifungals unnecessarily. Repeated use of these medications when you do not have a yeast infection can contribute to resistance in Candida strains. This means that when you genuinely develop a yeast infection in the future, the standard treatment may be less effective. Accurate diagnosis matters for effective treatment.
When Should You See a Doctor?
If this is your first time experiencing these symptoms, see a doctor. You cannot be sure what you have without a test. If you have had a yeast infection before and the symptoms feel identical, you may choose to use an over-the-counter treatment. However, if your symptoms do not improve within a few days, or if they return within two months, you need medical evaluation.
See a doctor immediately if you have pelvic pain, fever, chills, or pain during sex that is deep and internal. These symptoms suggest the infection may have spread to the uterus or fallopian tubes, which is a more serious condition called pelvic inflammatory disease. Also, if you are pregnant, do not self-treat. Both BV and yeast infections can complicate pregnancy, and you need a doctor’s guidance for safe treatment.
How Are BV and Yeast Infections Treated?
Yeast infections are treated with antifungal medications. These come as creams, ointments, vaginal suppositories, or an oral pill. The oral pill, fluconazole, requires a prescription. The creams and suppositories are available over the counter. Treatment courses range from a single dose to seven days, depending on the product and the severity of the infection.
Bacterial vaginosis is treated with antibiotics. The two main options are metronidazole, available as a pill or vaginal gel, and clindamycin, available as a cream or suppository. These all require a prescription. It is important to finish the entire course of antibiotics even if your symptoms go away early. Stopping early can cause the BV to return and may promote antibiotic resistance in the bacteria.
Can You Have Both at the Same Time?
Yes, it is possible to have a yeast infection and BV simultaneously. Studies have found that a significant number of women with one condition also have the other. This is one of the strongest reasons to see a doctor rather than self-treat. If you treat only for yeast, the BV remains. If you treat only for BV, the yeast remains. A doctor can test for both and prescribe a treatment plan that addresses each condition.
When both are present, you may have symptoms from each. You might have the fishy odor of BV along with the intense itching of a yeast infection. The discharge may not fit neatly into either category. This mixed picture makes self-diagnosis especially unreliable.
How To Prevent Recurrences
Prevention strategies differ for each condition. To reduce the risk of yeast infections, avoid unnecessary antibiotics, keep blood sugar under control if you have diabetes, and wear breathable cotton underwear. Avoid tight-fitting pants and synthetic fabrics that trap moisture. Some women find that reducing sugar intake helps, though the evidence for this is not strong.
To prevent BV, avoid douching completely. The vagina cleans itself, and douching disrupts the natural bacterial balance. Use mild, unscented soap on the outside only. Condom use during sex is associated with a lower risk of BV. Also, limit the number of sexual partners, as having a new partner increases the risk of BV developing.
Frequently Asked Questions
Can a yeast infection turn into BV?
No. They are separate conditions caused by different organisms. One does not transform into the other, though you can have both at the same time.
Is it safe to use boric acid for BV or yeast infections?
Boric acid vaginal suppositories are sometimes used for recurrent yeast infections that resist standard treatment, but no large human trials have confirmed their safety or effectiveness for BV. Boric acid is toxic if swallowed, so it must only be used vaginally under a doctor’s guidance.
How long does it take for BV to go away with treatment?
Most women notice improvement within two to three days of starting antibiotics. The full course of medication, usually five to seven days, should be completed even if symptoms resolve earlier.
Does a yeast infection cause a fishy smell?
No. A strong fishy odor is the hallmark of bacterial vaginosis. A yeast infection typically has no odor or only a mild, bread-like smell.

