Vaginitis: More Than Just a Yeast Infection

Why self-diagnosis so often gets it wrong

Itching, discharge, odor, and irritation show up across almost every cause of vaginitis, infectious or not, which means symptoms alone can't reliably tell you which one you have — even experienced clinicians confirm the cause with testing rather than going on symptoms alone. Repeatedly treating presumed yeast that isn't responding, or that keeps coming back right after you stop treatment, is one of the clearest signs something else is going on.

Infectious causes

Bacterial vaginosis (BV) is the most common cause of vaginitis in reproductive-age women — an overgrowth of certain bacteria that disrupts the normal vaginal balance, not a sexually transmitted infection, though sexual activity can influence risk. It typically causes a thin, gray-white discharge with a distinct fishy odor (more noticeable after sex), often without much itching. It's treated with prescription antibiotics (oral or vaginal metronidazole or clindamycin), and recurrence is common enough that a repeat course isn't unusual.

Vulvovaginal candidiasis (a yeast infection) is caused by an overgrowth of Candida, usually Candida albicans. Classic symptoms are thick, white, "cottage cheese" discharge with significant itching and irritation, usually without a strong odor. Over-the-counter and prescription antifungals both work well for straightforward cases — the problem is mainly that a meaningful share of self-diagnosed "yeast infections" turn out to be something else entirely, which is why symptoms that don't clear with OTC treatment are worth an actual exam rather than a second box of the same medication.

Trichomoniasis is a sexually transmitted infection caused by a parasite, and unlike BV and yeast, it requires treating any sexual partner(s) too, or reinfection is likely. It classically causes frothy, yellow-green discharge with odor, itching, and sometimes pain with urination, though a substantial number of people have few or no symptoms at all. It's treated with prescription oral antibiotics (metronidazole or tinidazole) and is confirmed with a specific test, not a general exam alone.

Desquamative inflammatory vaginitis (DIV)

DIV is a chronic inflammatory condition, not an infection, though it's very often mistaken for one because it causes persistent purulent (pus-like) discharge, burning, irritation, and pain with sex. The vaginal lining becomes inflamed and the surface cells shed abnormally — the cause isn't fully understood, and it doesn't show up on standard STI or yeast/BV testing, which is exactly why it tends to get repeatedly (and unsuccessfully) treated as a recurrent infection before someone thinks to look further. It's diagnosed by examination and microscopy that rules out infectious causes and shows the specific inflammatory pattern, and it's managed with prescription topical treatments — most often vaginal clindamycin or a topical corticosteroid, sometimes both — rather than antibiotics aimed at an infection that isn't actually there.

Atrophic vaginitis (genitourinary syndrome of menopause)

Falling estrogen — during perimenopause, after menopause, postpartum while breastfeeding, or from certain medications — thins and dries the vaginal tissue, which can cause irritation, burning, painful sex, and increased susceptibility to infection even without one being present. This is now more often called genitourinary syndrome of menopause (GSM) because it frequently comes with urinary symptoms too (urgency, more frequent UTIs), not just vaginal ones. Unlike an infection, it doesn't resolve on its own and tends to slowly worsen without treatment — vaginal moisturizers and lubricants help mild cases, while low-dose vaginal estrogen (cream, tablet, or ring) is very effective and, because it's minimally absorbed into the bloodstream, is an option for many people even when systemic hormone therapy isn't.

Vaginitis related to graft-versus-host disease (GVHD)

After an allogeneic stem cell or bone marrow transplant, graft-versus-host disease can affect the vagina the same way it affects skin and other mucous membranes elsewhere in the body — causing inflammation that, left unaddressed, can progress to scarring, adhesions, and narrowing of the vaginal canal. Early symptoms (dryness, burning, pain with sex) can look a lot like ordinary atrophic vaginitis, which is part of why routine gynecologic follow-up after transplant matters — catching it early with topical treatment (corticosteroids, vaginal estrogen, dilators to prevent narrowing) is far easier than reversing scarring after the fact. If you've had a stem cell or bone marrow transplant, this is worth raising proactively rather than waiting for symptoms to become severe.

Other causes worth knowing about

Allergic or irritant contact vaginitis comes from a reaction to something the vulvovaginal skin touched — scented soaps, douches, spermicides, latex, certain laundry detergents, or panty liners — and usually improves once the irritant is identified and stopped. Cytolytic vaginosis is a less common condition where an overgrowth of the vagina's own normal bacteria causes symptoms very similar to a yeast infection, but antifungals don't help because there's no yeast overgrowth to treat — it's identified by microscopy showing lactobacilli overgrowth without yeast or other pathogens present.

How it's actually diagnosed

A real diagnosis starts with your history and a pelvic exam, and usually includes checking vaginal pH and a sample examined under the microscope (a "wet mount") right in the office, sometimes alongside a culture or PCR test for specific infections. This is what separates conditions that look identical to the naked eye and to you — BV, yeast, trichomoniasis, DIV, and cytolytic vaginosis can produce very similar discharge and itching, but each needs a different treatment, and treating the wrong one doesn't just fail to help, it can delay finding the actual cause.