Green Discharge
Green discharge isn't part of a normal cycle, so it's worth getting checked, but the infections behind it are usually easy to treat. The most common cause is trichomoniasis, a sexually transmitted infection that can make discharge green, yellow or frothy. Gonorrhoea can also cause yellow or greenish discharge. Many people search for light green discharge with no smell or itching, hoping it's harmless. It can be mild, but most people with trichomoniasis have few or no symptoms, so a test is still the safest step. This page explains what green discharge means, whether it can happen without an STI, what it means in pregnancy, and how it's treated.
green discharge — worth a check
Green discharge isn't a normal cycle colour — it usually signals an infection and is worth a prompt check.
What green discharge means
Green or greenish-yellow discharge is not part of a normal cycle and is one of the clearer signs that something needs attention. It often points to an infection — commonly trichomoniasis or another sexually transmitted infection such as gonorrhoea — particularly when it's thick, frothy, or comes with a strong smell, itching, burning, or irritation. Unlike the white-to-clear range, green discharge doesn't have a routine, harmless explanation. The good news is that the infections behind it are common and very treatable, so the right move is simply to see a healthcare provider, who can identify the cause with a quick check and prescribe the appropriate treatment.
When you’ll usually see it
- With a strong or fishy odour
- With itching, burning, or irritation
- Thick or frothy in texture
To see roughly where today falls in your own cycle, our Menstrual Cycle Calculator maps out the four phases from your last period date.
What causes green discharge
Trichomoniasis is the classic cause. It can make discharge yellow-green, sometimes frothy, and it may smell, with itching or soreness around the vagina. Yet 70 to 85 in 100 people who have it notice mild symptoms or none at all.
Gonorrhoea can cause yellow or greenish discharge, often with burning when you pee or pain low in your belly. Bacterial vaginosis usually causes thin, grey-white discharge with a fishy smell, but it can look different from person to person.
Can you have green discharge without an STI?
Sometimes. Bacterial vaginosis, which isn't an STI, can also discolour discharge. But colour alone can't separate these from an STI. If the green is clear rather than a faint tint, lasts more than a few days, or you've had a new partner, a test is the only way to know.
Green discharge in pregnancy
In pregnancy, NHS advice is to contact your midwife or doctor if your discharge is green or yellow, smells, or comes with itching or pain when you pee.
Trichomoniasis in pregnancy is linked to waters breaking early, preterm birth and smaller babies. US guidelines recommend treating it when it causes symptoms in pregnancy, and the usual medicine, metronidazole, is considered low risk for the baby.
When to see a provider
See a provider if you notice green or greenish discharge, especially with an odour, itching, or irritation. The infections that cause it are common and easily treated once identified.
Green Discharge: your questions
- Is green discharge normal?
- Green discharge isn't a normal cycle colour — it usually signals an infection and is worth a prompt check. See a provider if you notice green or greenish discharge, especially with an odour, itching, or irritation. The infections that cause it are common and easily treated once identified.
- What does light green discharge with no smell or itching mean?
- It isn't always an STI, but green discharge is worth getting checked. But trichomoniasis often causes few or no symptoms, so if the green is new, lasts more than a few days, or you've had a new partner, get a quick test. It's usually a simple swab or urine sample.
- What kind of discharge is alarming?
- Get checked promptly if discharge is green, yellow-green or grey; frothy or clumpy; smells strong or fishy; or comes with itching, soreness, pain when you pee, belly pain, fever, or bleeding between periods or after sex. In pregnancy, also call about watery fluid you can't control, which may be your waters.
- When I wipe, there is green mucus. What does it mean?
- Clearly green mucus on the toilet paper usually means an infection rather than a normal cycle change. If it's definitely green, see a provider or sexual health clinic for a test rather than waiting for it to clear.
- How is green discharge treated?
- Treatment depends on the cause. Trichomoniasis is treated with antibiotics, usually a 7-day course of metronidazole for women, and sexual partners need treatment too so it doesn't come back. Gonorrhoea is treated with a single dose of antibiotics. Don't use leftover antibiotics or douches, and avoid sex until you and your partner have finished treatment.
Related guides
- Yellow discharge — pale yellow is often normal — here's how to tell
- Grey discharge — thin, fishy-smelling discharge and BV
- Pregnancy discharge by trimester — when to call your midwife
- Vaginal discharge colour guide — every colour side by side
Other types of discharge
← All discharge types: the full guide
Sources
Checked against the following public guidance on October 2, 2026. Advice can differ between countries; your doctor, nurse or midwife can apply it to you.