Greenish vaginal discharge is not normal. Healthy discharge ranges from clear to white to slightly off-white, and it’s generally odorless. A green or yellow-green tint typically signals an infection that needs treatment, most commonly bacterial vaginosis or a sexually transmitted infection called trichomoniasis.
What Normal Discharge Looks Like
Vaginal discharge changes throughout your menstrual cycle, but it stays within a predictable color range. In the days after your period, it tends to be dry or tacky with a white or light yellow tint. Mid-cycle, it becomes creamy and white, like yogurt. Around ovulation, it turns clear, slippery, and stretchy, resembling raw egg whites. After ovulation, it dries up again until your next period. Normal discharge is odorless or has a very faint scent.
The key markers of healthy discharge: clear, white, or off-white color, no strong odor, and no accompanying itching, burning, or pain. A slight yellow tinge can be normal, especially when discharge dries on underwear. But once you’re seeing a distinctly green or yellow-green color, that crosses the line into something your body is reacting to.
Trichomoniasis: The Most Common Cause
Trichomoniasis, often called “trich,” is one of the most common sexually transmitted infections and the condition most closely linked to greenish discharge. It’s caused by a microscopic parasite passed through sexual contact. The discharge it produces can range from clear to yellowish to greenish, often with a noticeably fishy smell. It may also be thinner than usual or heavier in volume than you’re used to.
Beyond the discharge itself, trichomoniasis often causes itching around the vulva, irritation, discomfort during urination, and sometimes lower abdominal pain. That said, many people with trich have mild symptoms or none at all, so the greenish discharge might be your only clue.
Diagnosis usually starts with a sample of vaginal secretions examined under a microscope, where the parasite can sometimes be spotted moving. This is the fastest method but not the most sensitive. Culture tests are more accurate but take 3 to 7 days for results. Your provider will choose the approach that makes sense for your situation.
Bacterial Vaginosis
Bacterial vaginosis (BV) is another common cause of yellow-green discharge. BV happens when the balance of bacteria in the vagina shifts, with normally harmless bacteria overgrowing. The discharge tends to be thin, sometimes gray, sometimes yellow-green, and it often carries a strong fishy odor, especially after sex.
BV is not a sexually transmitted infection, though sexual activity can increase the risk. It’s the most common vaginal condition in women of reproductive age. Unlike trichomoniasis, BV doesn’t usually cause significant itching or irritation, so the discharge and odor are often the main symptoms.
Other STIs to Rule Out
Gonorrhea can also cause abnormal discharge, though it’s more often described as thick, cloudy, or bloody rather than green. Chlamydia may produce unusual discharge as well, though without a characteristic color. When you visit a provider about greenish discharge, they’ll typically test for multiple infections at once, since symptoms overlap and more than one infection can be present at the same time.
Why It Matters During Pregnancy
Greenish discharge during pregnancy deserves prompt attention. Trichomoniasis during pregnancy is associated with premature rupture of membranes, preterm delivery, and low birth weight. Research has also linked pathological discharge in pregnancy to higher rates of neonatal respiratory distress, intensive care hospitalization, and early neonatal death. These are not guaranteed outcomes, but they underscore why treating the underlying infection quickly matters when you’re pregnant.
How Treatment Works
Both trichomoniasis and bacterial vaginosis are treated with prescription antibiotics. For trich, the standard course for women is an oral antibiotic taken twice a day for seven days. Men with trich typically receive a single, larger dose of the same medication. An alternative antibiotic is available if the first one isn’t tolerated well.
If trichomoniasis is the cause, your sexual partner needs treatment too, even if they have no symptoms. Reinfection is common when only one partner is treated. If symptoms come back after completing treatment and you’ve been re-exposed to an untreated partner, a repeat course of the same medication is the usual approach. If there’s been no re-exposure, your provider may adjust the dose or duration.
BV treatment follows a similar antibiotic approach, though the specifics differ. In both cases, treatment is straightforward and symptoms typically resolve within a week or two.
What the Color Is Telling You
Your body uses discharge as a signal. White, clear, or slightly off-white means the vaginal environment is balanced. Yellow-green or green, particularly with a fishy or foul odor, means something is off. Add in itching, burning, pain during urination, or unusual volume, and the signal gets louder. A single episode of slightly off-color discharge that resolves on its own may not mean much, but persistent greenish discharge is your body flagging an infection that won’t clear without treatment.