Vulvovaginitis is inflammation or infection of the vagina and the vulva, the external genital area. It’s one of the most common reasons people visit a gynecologist, and roughly 75% of women will experience at least one episode of vaginal yeast infection alone over a lifetime. The condition has several distinct causes, each with different symptoms and treatments.
Why It Happens
Vulvovaginitis falls into two broad categories: infectious and non-infectious. Infectious causes include an overgrowth of bacteria, yeast, or parasites. Non-infectious causes include chemical irritants, allergic reactions, and hormonal changes. Sometimes more than one cause is present at the same time.
Bacterial vaginosis (BV) is the single most common infectious cause. It occurs when the balance of naturally occurring bacteria in the vagina shifts, allowing certain anaerobic bacteria to multiply. A yeast infection, caused by Candida species, is the second most common. About 10% to 20% of women carry Candida in the vagina without any symptoms at all, so the mere presence of yeast doesn’t automatically mean infection. Trichomoniasis, caused by a parasite transmitted through sexual contact, is less common but more serious because of its potential complications.
Non-infectious vulvovaginitis often traces back to everyday products. Perfumed soaps, bubble baths, laundry detergents, fabric softeners, spermicides, and vaginal sprays can all irritate the delicate tissue. Tight-fitting synthetic clothing traps moisture and heat, creating a favorable environment for irritation and infection. Taking antibiotics for an unrelated illness can wipe out protective vaginal bacteria and trigger a yeast overgrowth. Prolonged corticosteroid use and having multiple sexual partners also raise risk.
Hormonal Changes and Vaginal Atrophy
After menopause, declining estrogen levels cause the vaginal lining to thin significantly. In a premenopausal vagina, healthy cells constantly shed and release glycogen, which beneficial bacteria (lactobacilli) convert into lactic acid. This process keeps the vaginal environment slightly acidic, which suppresses harmful bacteria. When estrogen drops, fewer cells shed, less glycogen is available, and the pH rises. That shift allows bacteria like streptococci, staphylococci, and coliforms to move in and cause inflammation.
Beyond the bacterial shift, lower estrogen also reduces blood flow and natural lubrication, while connective tissue increases and elasticity decreases. The result is dryness, irritation, and sometimes pain during sex. These changes are reversible with estrogen-based treatments.
How Symptoms Differ by Cause
Each type of vulvovaginitis produces distinctive symptoms, which is helpful for narrowing down the cause.
- Bacterial vaginosis: A thin, grayish-white discharge with a noticeable fishy smell, especially after sex. Itching is usually mild or absent.
- Yeast infection: Thick, white, cottage cheese-like discharge. Intense itching, redness, and swelling of the vulva are typical. There’s usually no strong odor.
- Trichomoniasis: Frothy, yellowish-green discharge with a foul smell. Itching, burning during urination, and redness are common.
- Irritant or allergic vulvovaginitis: Redness, burning, and soreness without an unusual discharge. Symptoms often appear shortly after contact with a new product.
- Atrophic vulvovaginitis: Dryness, burning, light spotting, and discomfort during intercourse, typically in postmenopausal women.
About 40% to 45% of women who get a yeast infection will have two or more episodes. Roughly 10% to 20% develop complicated or recurrent yeast infections that need longer or more intensive treatment.
How It’s Diagnosed
A healthcare provider typically starts with a pelvic exam and a sample of vaginal discharge. The pH of the vagina offers a quick clue: a pH above 4.5 points toward bacterial vaginosis or trichomoniasis, while yeast infections usually occur at a normal vaginal pH. A “whiff test,” where a chemical solution is applied to the discharge sample, can detect the fishy amine odor associated with BV or trichomoniasis. Under a microscope, the provider may look for clue cells (vaginal cells coated with bacteria, a hallmark of BV) or motile parasites characteristic of trichomoniasis.
Getting an accurate diagnosis matters because the treatments are completely different for each cause, and using the wrong one can make symptoms worse or allow the real problem to persist.
Treatment by Type
Bacterial vaginosis is treated with prescription antibiotics, typically taken orally for about a week or applied as a vaginal gel or cream for five to seven days. Yeast infections respond to antifungal medications, many of which are available over the counter as vaginal creams or suppositories. Oral antifungal options are also available by prescription. Trichomoniasis requires a specific prescription antibiotic, and sexual partners need to be treated simultaneously to prevent reinfection.
For irritant-related vulvovaginitis, the treatment is identifying and removing the offending product. Switching to unscented soap, avoiding douching, and wearing loose cotton underwear often resolves symptoms within a couple of weeks. Atrophic vulvovaginitis is typically treated with vaginal estrogen, which restores thickness and lubrication to the vaginal lining.
Risks During Pregnancy
Vulvovaginitis during pregnancy is not just uncomfortable. Bacterial vaginosis and trichomoniasis both increase the risk of preterm labor and preterm birth. Babies born early may face low birth weight and breathing problems. Certain sexually transmitted infections that cause vaginitis can also pass from mother to infant before, during, or after delivery.
Vulvovaginitis in Children
Prepubescent girls are more susceptible to vulvovaginitis than many parents realize. Their anatomy plays a role: the vaginal opening sits close to the anus, and the vulva lacks the protective fatty tissue and hair that develop during puberty. As children learn to use the bathroom independently, incomplete wiping and poor front-to-back technique can introduce bacteria from the bowel.
Common triggers in children include bubble baths, harsh soaps, chlorine from swimming pools, tight clothing, and pinworm infections. Foreign objects (small toys, tissue paper) occasionally cause persistent symptoms. Skin conditions like eczema can also affect the vulvar area.
Most pediatric vulvovaginitis improves with basic hygiene changes: wiping front to back, wearing white cotton underwear, sleeping without underwear at night, bathing in plain warm water without bubble bath, and avoiding scented products. Patting the area dry rather than rubbing, and changing out of wet swimsuits promptly, also help. For infants, frequent diaper changes and brief periods of air exposure reduce irritation. Symptoms typically improve within two weeks of adopting these practices.
Reducing Your Risk
You can’t prevent every episode, but a few habits lower the odds considerably. Avoid douching, which disrupts the vagina’s natural bacterial balance. Choose unscented soaps, detergents, and hygiene products. Wear breathable cotton underwear and avoid sitting in wet clothing. If you notice symptoms after starting a new product, stop using it and see if things improve. When taking antibiotics for another condition, be aware that a yeast infection may follow, and talk to your provider about preventive options if you’re prone to them.