The most reliable signs of a vaginal infection are a change in your discharge (color, thickness, or smell), itching or burning around the vulva, and discomfort when you pee or have sex. Most vaginal infections fall into three categories, and each one produces a distinct pattern of symptoms that can help you narrow down what’s going on.
The Three Most Common Types
Nearly all vaginal infections are caused by one of three things: an overgrowth of yeast, a bacterial imbalance called bacterial vaginosis (BV), or a sexually transmitted parasite called trichomoniasis. They share some overlapping symptoms, but the type of discharge you see is often the clearest way to tell them apart.
Yeast infection: Thick, white, odorless discharge that can look like cottage cheese. You may notice a white coating in and around the vagina. Intense itching and irritation are the hallmark symptoms, and the skin around the vulva may look red or swollen.
Bacterial vaginosis: Grayish, thin or foamy discharge with a noticeable fishy smell. BV typically does not cause significant redness or swelling. The odor often becomes stronger after sex. Itching can occur but is usually milder than with a yeast infection.
Trichomoniasis: A thin discharge that may be clear, white, yellowish, or greenish, often with a fishy smell. Itching, burning, redness, and soreness of the genitals are common, along with discomfort when peeing. Trichomoniasis is sexually transmitted, with an estimated 156 million new cases worldwide each year.
What Your Discharge Is Telling You
Healthy vaginal discharge is usually clear to milky white, mild in smell, and changes slightly throughout your menstrual cycle. When an infection is present, the discharge shifts in ways that reflect what’s causing the problem. A thick, clumpy texture without odor points toward yeast. A thin, grayish discharge with a fishy smell points toward BV. A yellowish or greenish tint, especially with irritation and burning, suggests trichomoniasis.
There’s also a less well-known condition called aerobic vaginitis, which can look similar to BV but behaves differently. The discharge tends to be yellow to green and thick rather than thin, and the smell is more of a foul or rotten odor rather than fishy. Unlike BV, aerobic vaginitis causes visible inflammation: the vaginal walls may appear red and swollen, and small sores or erosions can develop. If your symptoms don’t fit neatly into the yeast or BV categories, this is one reason a clinical exam can be valuable.
Symptoms That Overlap
Itching, burning, and general discomfort are common across all types of vaginal infections, which is why discharge characteristics matter so much for narrowing things down. Pain during sex can happen with any of them. So can a vague feeling that something is “off” without dramatic symptoms. Some infections, particularly BV and trichomoniasis, can be present with very mild or no noticeable symptoms at all, which means you can have an infection without realizing it.
Can You Test at Home?
Over-the-counter vaginal pH test kits are available at most pharmacies. A healthy vaginal pH falls between 3.8 and 4.5. BV and trichomoniasis both raise the pH above 4.5, so a high reading can confirm that something is off. The FDA notes that home pH tests show good agreement with a doctor’s diagnosis. However, a yeast infection typically does not change your pH, so a normal result doesn’t rule out infection entirely.
These kits are most useful as a first step. A high pH tells you that you likely have BV or trichomoniasis, but it can’t distinguish between the two. And if you’ve never had a vaginal infection before, testing alone won’t give you the full picture. A clinician can examine discharge under a microscope, check for specific bacterial patterns, and run a swab test for trichomoniasis to give you a definitive answer.
Infections During Pregnancy
Yeast infections are more common during pregnancy and often harder to get under control. They don’t pose a major risk to the pregnancy itself, but if left untreated, a yeast infection can be passed to the baby’s mouth during delivery, causing a condition called thrush. An untreated infection can also complicate delivery. BV during pregnancy carries additional risks, including preterm birth, so getting an accurate diagnosis matters more during this time.
Signs Something More Serious Is Happening
Most vaginal infections are uncomfortable but not dangerous. However, some symptoms signal that the infection may have spread beyond the vagina. Fever, chills, or pelvic pain alongside vaginal symptoms can indicate pelvic inflammatory disease, which is a more serious infection of the uterus and fallopian tubes. These symptoms warrant prompt medical attention rather than home treatment.
If your symptoms come back repeatedly after treatment, if you’re unsure whether what you’re experiencing is a yeast infection or something else, or if you’ve never had a vaginal infection before, a clinical evaluation will give you a clearer answer than self-diagnosis alone. Getting the type of infection right matters because the treatments are completely different: antifungals for yeast, antibiotics for BV, and a specific antiparasitic for trichomoniasis.