Vaginal burning has several common causes, and most of them are treatable once you know what’s going on. The sensation can come from infections, chemical irritants, hormonal changes, or chronic pain conditions. Figuring out which one depends on what other symptoms you have alongside the burning.
Yeast Infection vs. Bacterial Vaginosis
These two are the most common culprits, and they feel different in important ways. A yeast infection produces thick, white, odorless discharge, often with a white coating in and around the vagina. The burning tends to come with intense itching. Bacterial vaginosis (BV), on the other hand, typically causes grayish, foamy discharge with a noticeable fishy smell. BV is actually the most common type of vaginitis overall, caused by an imbalance in the bacteria that normally live in the vagina.
One key difference is acidity. A healthy vagina sits at a pH of about 4.0 to 4.5, which is moderately acidic. In BV, the pH rises above 4.5, and with a yeast infection, it often stays in the normal range. That’s why pH test strips sold in drugstores can sometimes help you tell the two apart, though they’re not a substitute for a proper diagnosis.
BV is treated with a course of oral or vaginal antibiotics, typically taken for five to seven days. Yeast infections respond to antifungal treatments, many of which are available over the counter. If you’ve never had a yeast infection before or aren’t sure that’s what you’re dealing with, it’s worth getting tested rather than guessing. Misusing antifungal treatments can make BV worse, and vice versa.
Sexually Transmitted Infections
Burning during urination is a hallmark symptom of both chlamydia and gonorrhea. Chlamydia symptoms typically appear 5 to 14 days after exposure, while gonorrhea symptoms in the genital tract tend to show up within about 10 days. Both can also cause unusual discharge or pelvic discomfort, but many people with these infections have no symptoms at all, which is why routine screening matters if you’re sexually active with new partners.
Trichomoniasis, caused by a tiny parasite spread through sexual contact, directly targets the vaginal tissue and produces itching, burning, soreness, and irritation. Symptoms can take anywhere from 5 to 28 days to appear. The vaginal pH with trichomoniasis often climbs to 6.5 or higher, well above normal. All three of these infections are curable with prescription medication, but they require a lab test to confirm.
Chemical Irritants and Allergic Reactions
Sometimes the burning isn’t caused by an infection at all. The vulvar skin is highly sensitive to chemicals in everyday products. In studies of vulvar allergic reactions, fragrances were clinically relevant in 60% of cases where patients tested positive. That includes perfumed toiletries, scented sanitary pads, wet wipes, bath products, and even scented toilet paper. Preservatives in personal care products are another frequent trigger.
Less obvious irritants include:
- Dark-colored underwear: textile dyes can cause contact reactions, and at least one documented case resolved completely after switching to lighter-colored underwear
- Depilatory wax: contains colophony (a tree resin) that can trigger allergic burning
- Douches and vaginal sprays: disrupt the natural bacterial balance and directly irritate tissue
- Spermicidal products: contain detergent-like chemicals that can cause inflammation
- Forgotten tampons or small pieces of toilet paper: foreign material in the vagina causes irritation and sometimes infection
If the burning started after you switched a product (new soap, laundry detergent, pads, or underwear), try eliminating it for a week or two to see if symptoms improve. Washing the vulva with plain warm water and wearing unscented, undyed cotton underwear is a reasonable first step.
Low Estrogen and Vaginal Dryness
After menopause, or after surgical removal of the ovaries, dropping estrogen levels directly affect the vaginal lining. Estrogen keeps the vaginal walls thick, well-lubricated, and elastic by promoting blood flow and stimulating the cells that produce moisture. When estrogen drops, the tissue thins, loses its folds, and becomes fragile. The glands that produce lubrication slow down. This makes the tissue vulnerable to small tears and a persistent burning or raw feeling, especially during or after sex.
The changes go deeper than just dryness. Without adequate estrogen, the vaginal microbiome shifts. The protective bacteria decline, harmful bacteria from the gut can take over, and the pH rises from its normal acidic range to somewhere between 5.5 and 6.8. This higher pH makes you more susceptible to infections on top of the irritation you’re already experiencing. Vaginal estrogen therapy (applied locally as a cream, ring, or tablet) is the most common treatment and works by restoring thickness and moisture to the tissue.
Chronic Burning Without a Clear Cause
If you’ve been tested for infections, eliminated irritants, and the burning persists for three months or more, you may be dealing with vulvodynia. This is chronic vulvar pain without an identifiable cause, and it affects a significant number of people, though it’s frequently underdiagnosed.
Vulvodynia is diagnosed partly by ruling out other conditions and partly through a cotton swab test, where a clinician gently presses a swab against specific points on the vulva to map where the pain occurs. If pain is limited to the vaginal opening, it’s called localized vestibulodynia. If it extends across broader areas, it’s generalized vulvodynia. The pain can be constant or triggered only by touch or pressure (like sitting, wearing tight clothing, or during sex).
Treatment for vulvodynia is multimodal, meaning it typically combines several approaches. Pelvic floor physical therapy has some of the strongest evidence, using biofeedback, manual therapy, and dilators to retrain the muscles and nerves in the area. Topical numbing ointments applied overnight can reduce pain over time. Acupuncture and nerve stimulation therapy have also shown benefit in controlled trials. Vulvodynia is manageable, but it usually takes patience and a provider who specializes in it.
A Note on Boric Acid Suppositories
Boric acid vaginal suppositories are widely sold over the counter and marketed for recurrent yeast infections and BV. They’ve been used for decades, and they do have a role, particularly for yeast strains that resist standard antifungal treatment. The typical dose described in clinical literature is a 600 mg suppository used intravaginally for 14 days, though no formal dose-range studies have ever been done to establish the ideal amount.
There are real safety concerns worth knowing about. Boric acid is not FDA-approved as a drug, and over-the-counter products vary in purity and dosage. It is fatal if swallowed, so it needs to be kept away from children and used only as directed. It should be avoided during pregnancy or if there’s any chance of pregnancy, because of potential harm to a developing fetus. And perhaps most importantly, using boric acid to self-treat can mask symptoms of a more serious condition, making it harder for a provider to diagnose what’s actually going on. If burning is new, unexplained, or getting worse, getting tested first is a better path than reaching for an OTC suppository.
Symptoms That Need Prompt Attention
Most vaginal burning resolves with the right treatment, but certain combinations of symptoms point to something that shouldn’t wait. Burning paired with fever, severe pelvic pain, or foul-smelling discharge could indicate a spreading infection. New burning after unprotected sex warrants STI testing even if you have no other symptoms. Burning with visible sores, blisters, or ulcers needs evaluation to rule out herpes or other conditions. And any vaginal burning during pregnancy deserves a prompt call to your provider, since some infections carry risks for the pregnancy if left untreated.