Vaginal itching and burning are most commonly caused by infections, chemical irritants, or hormonal changes. About 75% of women experience a vaginal yeast infection at least once, and bacterial vaginosis affects roughly one in four women globally. These two conditions alone account for most cases, but the list of possible causes is longer, and the specific pattern of your symptoms can help narrow it down.
Yeast Infections
The fungus Candida albicans is responsible for most vaginal yeast infections. Your vagina naturally contains both yeast and bacteria, and a type of bacteria called lactobacillus keeps yeast levels in check. When something disrupts that balance (antibiotics, pregnancy, a weakened immune system, high blood sugar), candida can multiply or grow deeper into vaginal cells, triggering symptoms.
The hallmark of a yeast infection is thick, white discharge that looks like cottage cheese and has little to no odor. Along with itching and irritation of the vagina and vulva, you may notice a burning sensation during urination or sex, plus redness and swelling. If you’ve had a yeast infection before and recognize the pattern, over-the-counter antifungal treatments are an option. But if this is your first time, or symptoms don’t clear up within a few days of treatment, it’s worth getting a proper diagnosis because other conditions can look similar.
Bacterial Vaginosis
Bacterial vaginosis (BV) develops when “bad” bacteria in the vagina outgrow the protective lactobacillus. This shifts the vaginal pH above its normal acidic range (higher than 4.5), creating an environment where irritation and discharge thrive. BV is roughly as common as yeast infections, affecting about 23% of women in studies of those seeking care for vaginal symptoms.
The easiest way to tell BV apart from a yeast infection is the discharge. BV produces a thin, milky discharge with a noticeable fishy odor, rather than the thick, odorless cottage-cheese texture of yeast. Itching and a burning feeling when you pee can occur with both, so discharge characteristics are the most reliable clue before you see a provider. BV requires prescription antibiotics and won’t resolve with antifungal creams.
Sexually Transmitted Infections
Trichomoniasis is the STI most likely to cause vaginal itching and burning. It’s caused by a parasite, and while its global prevalence sits around 5%, it’s often underdiagnosed because symptoms can be mild or absent. When symptoms do appear, they include genital itching, burning, redness, discomfort while urinating, and a thin discharge that may be clear, white, yellowish, or greenish with a fishy smell.
Trichomoniasis can look a lot like BV on the surface, and the two sometimes occur together. Herpes and chlamydia can also cause burning or irritation, though herpes typically involves visible blisters or sores and chlamydia often causes no symptoms at all until it progresses. Any new sexual partner, unprotected sex, or combination of itching with unusual sores or pelvic pain warrants testing.
Chemical Irritants and Contact Dermatitis
Vulvar skin is thinner and more sensitive than skin elsewhere on your body, which makes it vulnerable to contact dermatitis from everyday products. The list of potential triggers is surprisingly long: soap, bubble bath, shampoo, deodorant, perfume, douches, talcum powder, laundry detergent, dryer sheets, menstrual pads, panty liners, tampons, spermicides, toilet paper, tea tree oil, synthetic underwear fabrics like nylon, and even dyes or food preservatives in products that contact the area.
Contact dermatitis typically causes itching, burning, and redness without the distinct discharge patterns of infections. The key question is whether you’ve recently switched products or started using something new. Switching to fragrance-free, dye-free alternatives and wearing cotton underwear often resolves symptoms within a few days. If it doesn’t, the cause is likely something other than irritation.
Hormonal Changes and Vaginal Atrophy
Declining estrogen levels, most commonly during and after menopause, cause the vaginal lining to become thinner, drier, and less elastic. This condition, called vaginal atrophy, reduces blood flow to vaginal tissue and makes it more fragile and prone to irritation. The result is persistent itching, burning, spotting, and pain during sex.
Vaginal atrophy doesn’t only affect postmenopausal women. Breastfeeding, certain cancer treatments, surgical removal of the ovaries, and some medications can all lower estrogen enough to trigger the same changes. Unlike infections, vaginal atrophy tends to develop gradually and worsen over time rather than appearing suddenly. Topical estrogen treatments prescribed by a provider are the most effective approach, and moisturizers designed for vaginal use can help manage day-to-day dryness.
Skin Conditions
Chronic or recurring vulvar itching that doesn’t respond to infection treatment may point to a skin condition. Lichen sclerosus is one of the more common culprits. It causes patchy, discolored, thin skin on the vulva and anal area, along with itching, soreness, burning, fragile skin that bruises or tears easily, and painful sex. Some people develop blistering or open sores.
Eczema and psoriasis can also affect vulvar skin, producing persistent itching and irritation that flares and subsides over time. These conditions require different treatment than infections, typically involving prescription topical medications. If your symptoms keep coming back despite treating for yeast or BV, a skin condition is worth investigating.
How to Tell What You’re Dealing With
Your discharge is the single most useful clue. Thick, white, cottage-cheese-like discharge with no odor points toward yeast. Thin, milky discharge with a fishy smell suggests BV. Thin, discolored discharge (yellow or green) with a fishy odor raises the possibility of trichomoniasis. Itching and burning without any notable discharge change often indicates contact dermatitis, hormonal dryness, or a skin condition.
Co-infections are more common than many people realize. In one study of women with vaginitis symptoms, about 6% had two or more infections at the same time, most often BV and a yeast infection together. This is one reason symptoms can be confusing, and why treatment for one condition sometimes doesn’t fully resolve things.
Symptoms that call for prompt evaluation include fever, pelvic or abdominal pain, blisters or sores on the vulva or vagina, a sudden change in discharge amount, color, odor, or consistency, burning with urination, possible STI exposure, or symptoms that persist longer than a week despite home care. These patterns can signal infections that need specific treatment or conditions that worsen without intervention.