A burning sensation in the vagina is most commonly caused by an infection, an irritant, or a change in hormone levels. Less often, it signals a chronic pain condition. The cause usually becomes clear based on whether you also have unusual discharge, whether the burning is constant or triggered by touch, and whether it started suddenly or built up over time.
Yeast Infections
A vaginal yeast infection is one of the most common reasons for burning, and it typically comes with intense itching and a thick, curdy white discharge. The burning often gets worse during urination or sex. Yeast infections happen when a fungus that normally lives in the vagina in small amounts overgrows, usually after antibiotic use, during pregnancy, or in people with weakened immune systems.
Most uncomplicated yeast infections clear up within a few days of starting antifungal treatment, which is available over the counter as a cream or suppository. If you’ve treated what you assumed was a yeast infection and the burning hasn’t improved after a week, it’s worth getting tested. The symptoms overlap significantly with other conditions, and studies show that many people who self-diagnose a yeast infection actually have something else.
Bacterial Vaginosis
Bacterial vaginosis (BV) occurs when the balance of bacteria inside the vagina shifts, allowing certain species to dominate. The hallmark symptom is a thin, milklike discharge with a fishy smell, but burning and irritation are common too. A healthy vaginal pH sits between 3.8 and 4.5. In BV, the pH rises above 4.5, making the environment less acidic and more hospitable to the bacteria causing symptoms.
BV is treated with prescription antibiotics, typically taken orally or applied as a vaginal gel. It’s not a sexually transmitted infection, though sexual activity can increase the risk. One frustrating aspect of BV is recurrence: many people experience repeat episodes within months of successful treatment.
Sexually Transmitted Infections
Trichomoniasis, chlamydia, and gonorrhea can all cause vaginal burning, though they don’t always. About 70% of people with trichomoniasis have no symptoms at all. When symptoms do appear, they range from mild irritation to severe inflammation, often with a thin or yellowish-green discharge and discomfort while urinating. The CDC estimated over two million trichomoniasis infections in the U.S. in 2018.
Chlamydia and gonorrhea are similarly sneaky. Both can cause burning, abnormal discharge, and pain during urination, but many infections produce no obvious symptoms for weeks or longer. This is why STI testing matters even when symptoms are mild or ambiguous. Left untreated, these infections can spread to the uterus and fallopian tubes and cause lasting damage to fertility.
Contact Irritants
Sometimes the burning has nothing to do with infection. The vulvar and vaginal tissues are sensitive, and everyday products can trigger irritation or an allergic reaction known as contact dermatitis. Common culprits include soap, bubble bath, scented pads or panty liners, laundry detergent, spermicides, douches, and perfumed products applied near the genitals. Even shampoo or conditioner rinsing over the vulva during a shower can be enough.
If your burning started around the same time you switched a product, that’s a strong clue. The fix is straightforward: stop using the suspected irritant and switch to fragrance-free, dye-free alternatives. Symptoms from contact irritation usually fade within a few days once the trigger is removed. If they don’t, an infection or another cause is more likely.
Low Estrogen and Vaginal Atrophy
If you’re in perimenopause, postmenopause, or breastfeeding, declining estrogen levels may be behind the burning. Without adequate estrogen, the vaginal lining becomes thinner, drier, and less elastic. Blood flow to the area decreases, and the natural moisture that keeps tissues comfortable drops off. The vaginal canal can also narrow and shorten. All of this makes the tissue more fragile, more easily irritated, and prone to a persistent burning or stinging sensation, especially during or after sex.
This condition, sometimes called vaginal atrophy or genitourinary syndrome of menopause, affects a large percentage of postmenopausal women and tends to get worse over time without treatment. Vaginal moisturizers used regularly can help with day-to-day dryness, while prescription estrogen applied locally (as a cream, ring, or tablet) restores thickness and moisture to the tissue more effectively. Unlike hot flashes, which often improve on their own, vaginal atrophy generally does not resolve without intervention.
Vulvodynia
When burning persists for three months or longer and no infection, skin disease, or obvious cause can be found, the diagnosis may be vulvodynia. This is a chronic pain condition of the vulva most commonly described as burning, stinging, irritation, or rawness. Some people feel it across the entire vulva, while others have pain concentrated in one spot, often near the vaginal opening.
Vulvodynia symptoms can be constant or come and go without warning. In some cases, pain only occurs when the area is touched, during sex, while inserting a tampon, or even while sitting for long periods. In other cases, the burning is there all the time regardless of contact. Because there’s no visible rash or lab test that confirms it, vulvodynia is diagnosed by ruling everything else out first. Treatment varies and often involves a combination of approaches: topical numbing agents, pelvic floor physical therapy, certain oral medications that calm nerve pain, and sometimes cognitive behavioral therapy to manage the impact on daily life.
How Providers Figure Out the Cause
A vaginal pH test is often the first step. A reading between 3.8 and 4.5 is typical. A pH above 4.5 points toward bacterial vaginosis or trichomoniasis and helps rule out a yeast infection, which usually keeps the pH in the normal range. You can buy pH test strips over the counter, but they only tell you whether your pH is off, not why.
In a clinic, a provider may take a sample of vaginal discharge and examine it under a microscope. A saline preparation can reveal the movement of trichomoniasis parasites or the “clue cells” characteristic of BV. A separate preparation using a potassium hydroxide solution dissolves most cells and makes the branching structures of yeast visible. If these tests come back normal but symptoms continue, a fungal culture or STI panel can catch infections that the initial tests missed.
The type of discharge you’re experiencing, if any, gives useful information before you even get to a provider. Thick, white, and clumpy suggests yeast. Thin, grayish, and fishy-smelling suggests BV. Yellowish-green and frothy suggests trichomoniasis. No unusual discharge at all, combined with persistent burning, points more toward irritant exposure, hormonal changes, or vulvodynia.