Trichomoniasis in women most commonly shows up as a yellow-green, frothy vaginal discharge with a strong fishy odor. But about half of women with the infection have no visible symptoms at all, which is one reason it spreads so easily. When symptoms do appear, the discharge is the most obvious sign, often accompanied by redness, irritation, and discomfort around the vulva and vagina.
What the Discharge Looks Like
The hallmark of trichomoniasis is a thin, frothy discharge that ranges from yellowish to green. The volume is often noticeably higher than normal, and the texture can appear bubbly or foamy. The smell is typically strong and fishy, sometimes intensifying after sex.
The discharge can also be clear or white, which makes it harder to distinguish from other infections based on appearance alone. The frothiness and increased volume, combined with the odor, are the most distinctive features. Not every woman with trichomoniasis will see the classic yellow-green color, but when it’s present, it’s a strong visual clue.
How It Differs From Yeast Infections and BV
Three infections cause the majority of abnormal vaginal discharge, and they each look different. A yeast infection produces a thick, white, cottage cheese-like discharge that usually doesn’t smell. Bacterial vaginosis causes a thin, off-white discharge with a fishy odor but without frothiness. Trichomoniasis produces the most colorful and voluminous discharge of the three: profuse, yellow-green, frothy, and strongly malodorous.
The overlap in symptoms, especially with BV (both can smell fishy), is why visual appearance alone isn’t reliable for diagnosis. But if you’re seeing greenish, bubbly discharge with irritation, trichomoniasis is the more likely explanation.
Visible Signs Beyond Discharge
The vulva and vaginal opening often appear red, swollen, and irritated. Some women notice soreness or a raw feeling, especially during urination or sex. The skin around the vaginal opening can look inflamed or slightly excoriated from the constant irritation.
Inside the vagina, a small percentage of women develop what’s called a “strawberry cervix,” where the cervix appears dotted with tiny red spots from broken blood vessels. This shows up in only about 2% of women during a routine exam, though it’s more visible under magnification. When present, it’s a strong indicator of trichomoniasis, but most women wouldn’t see this themselves.
When There Are No Visible Signs
Roughly half of women with trichomoniasis are completely asymptomatic. They have no unusual discharge, no odor, no irritation. This doesn’t mean the infection is less serious or less contagious. Asymptomatic carriers can still pass the parasite to sexual partners, and the infection can persist for months or even years without treatment.
Some women develop symptoms weeks or months after initial infection, while others never do. This is why testing matters more than visual inspection. If a sexual partner has been diagnosed, getting tested is important even without any noticeable changes.
How Testing Works
A visual exam isn’t enough to confirm trichomoniasis. The traditional test, wet mount microscopy, involves placing a sample of vaginal fluid on a slide and looking for the moving parasites under a microscope. It’s quick and cheap but catches only 36% to 75% of infections, meaning it misses a significant number of cases.
Molecular tests (NAATs) are far more accurate, detecting three to five times more infections than a wet mount. These tests analyze DNA from a vaginal swab or urine sample and have sensitivities above 90%. If you’re being tested for trichomoniasis, it’s worth confirming that your provider is using one of these newer tests rather than relying solely on microscopy.
Risks of Leaving It Untreated
Trichomoniasis isn’t just uncomfortable. It increases vulnerability to other sexually transmitted infections, including HIV, by disrupting the protective barrier of the vaginal lining. The chronic inflammation creates an environment where other infections take hold more easily.
During pregnancy, the risks are more specific. A meta-analysis of available studies found that pregnant women with trichomoniasis had roughly 1.3 times the odds of preterm delivery, nearly twice the odds of premature rupture of membranes, and about twice the odds of delivering a low birth weight baby compared to uninfected women. These aren’t dramatic increases individually, but they’re consistent enough to take seriously.
What Recovery Looks Like
Trichomoniasis is treated with a single course of oral antibiotics. Symptoms typically start improving within a few days of starting treatment. The discharge, odor, and irritation gradually resolve, though it’s important to avoid sexual contact until both you and your partner have completed treatment and symptoms have fully cleared. Reinfection is common when partners aren’t treated simultaneously, so the visual signs can return quickly if only one person is treated.