The clearest signs of a vaginal infection are a change in your discharge (color, texture, or amount), an unusual odor, and itching or burning around the vulva. Most vaginal infections fall into three categories: yeast infections, bacterial vaginosis, and trichomoniasis. Each one produces a distinct pattern of symptoms, and knowing what to look for can help you figure out what’s going on before you see a provider.
What Normal Discharge Looks Like
Before you can spot something abnormal, it helps to know your baseline. Healthy vaginal discharge changes throughout your menstrual cycle. In the days after your period, it tends to be dry or tacky and white or slightly yellow. Around days 7 to 9, it becomes creamy and cloudy, similar to yogurt. Near ovulation (roughly days 10 to 14 of a 28-day cycle), it turns clear, slippery, and stretchy, resembling raw egg whites. After ovulation, it dries up again until your next period.
Normal discharge is generally odorless. A healthy vaginal pH sits between 3.8 and 5.0 for women of reproductive age, kept acidic by beneficial bacteria. During your period, menstrual blood is slightly alkaline and can temporarily raise that pH, which is why some people notice mild changes in discharge or scent around menstruation. None of that, on its own, signals an infection.
Signs of a Yeast Infection
Yeast infections are the most recognizable type. The hallmark is intense itching and burning around the vulva and vaginal opening, often accompanied by a thick, white, clumpy discharge that’s frequently compared to cottage cheese. The discharge typically has little to no odor. You may also feel burning when you urinate or during sex. Redness and swelling around the vulva are common.
One distinguishing feature: yeast infections generally do not raise vaginal pH above 4.5. That means if you use an over-the-counter pH test strip and get a normal reading, a yeast infection is still possible. The FDA notes that a negative pH test “could indicate the possibility of a yeast infection,” so a normal result doesn’t rule one out.
Signs of Bacterial Vaginosis
Bacterial vaginosis (BV) is actually more common than yeast infections, though it gets less attention. The signature symptom is a thin, grayish-white or yellowish discharge with a distinct fishy smell. The odor often becomes stronger after sex or during your period. Unlike yeast infections, BV usually does not cause significant itching or irritation, though some people do experience mild burning.
BV shifts the vaginal pH above 4.5. Clinicians diagnose it using a set of criteria that includes that elevated pH, the fishy odor, the characteristic thin discharge, and the presence of specific cells visible under a microscope. You won’t be able to check all of those at home, but the combination of a fishy smell with a thin, off-colored discharge is a strong indicator.
Signs of Trichomoniasis
Trichomoniasis is a sexually transmitted infection caused by a parasite, and it can look like BV at first glance. The discharge may be clear, white, yellowish, or greenish, and it often has a fishy smell. What sets trichomoniasis apart is that it’s more likely to cause noticeable irritation: itching, burning, redness, and discomfort during urination or sex. Some people describe a frothy or foamy quality to the discharge, though not everyone notices that.
Many people with trichomoniasis have no symptoms at all, which is one reason it spreads easily. Current screening guidelines recommend testing for trichomoniasis in anyone who comes in with a vaginal discharge complaint, particularly those with multiple sexual partners or a history of other STIs.
Quick Comparison of the Three Infections
- Yeast infection: thick, white, clumpy discharge; little or no odor; intense itching and burning; normal pH
- Bacterial vaginosis: thin, gray-white or yellow discharge; fishy odor (especially after sex); mild or no itching; elevated pH
- Trichomoniasis: variable discharge color (clear to greenish); fishy odor; itching, burning, and irritation; elevated pH; sexually transmitted
What At-Home pH Tests Can and Can’t Tell You
Over-the-counter vaginal pH test strips are widely available at pharmacies. You insert a small strip, compare the color change to a chart, and get a reading. The FDA says these tests show “good agreement” with a doctor’s assessment of pH. If your result comes back elevated (above 4.5), that suggests BV or trichomoniasis is possible.
The limitations are significant, though. An elevated pH doesn’t tell you which infection you have, since both BV and trichomoniasis raise it. A normal pH doesn’t mean you’re infection-free, because yeast infections leave pH unchanged. And pH can shift for non-infectious reasons: recent sex, menstruation, or even certain soaps. These tests also cannot detect STIs like chlamydia, gonorrhea, herpes, or HIV. Think of a pH strip as one data point, not a diagnosis.
Conditions That Mimic an Infection
Not every itch or unusual discharge means you have an infection. Contact irritation is one of the most common mimics. Vaginal sprays, douches, scented soaps, spermicides, certain detergents, and fabric softeners can all trigger burning, itching, and discharge that looks a lot like an infection. If your symptoms started around the same time you switched products, that’s worth noting. Stopping the product often resolves things on its own.
Hormonal shifts can also cause vaginal irritation without any infection being present. Pregnancy, breastfeeding, and menopause all change estrogen levels, which affects vaginal moisture, pH, and tissue thickness. Postmenopausal women in particular often experience dryness, irritation, and a higher resting pH that can be mistaken for BV.
There are also chronic skin conditions that cause persistent vulvar itching. These include lichen planus, which causes pain and itching in roughly 80% of cases, and lichen simplex chronicus, a condition driven by a self-reinforcing itch-scratch cycle that thickens the skin over time. These look and feel different from infections but can overlap enough to cause confusion. If you’ve been treating yourself for yeast infections repeatedly without improvement, a skin condition is worth considering.
When Self-Diagnosis Falls Short
Studies consistently show that people who self-diagnose vaginal infections are wrong about half the time, even when they’ve had the same type of infection before. The overlap in symptoms between yeast, BV, and trichomoniasis is real, and over-the-counter yeast treatments won’t help BV or trichomoniasis. If your symptoms are new, recurrent, or don’t improve after a few days of treatment, a clinical evaluation gives you a clearer answer. Providers can examine the discharge under a microscope, run a pH test alongside other criteria, and test for STIs that home kits miss entirely.
Pay particular attention to symptoms that go beyond typical vaginal irritation: fever, pelvic pain, or pain deep in the lower abdomen. These can signal pelvic inflammatory disease, which involves infection spreading beyond the vagina and cervix and requires prompt treatment to prevent complications.