Grey discharge is almost always a sign of bacterial vaginosis (BV), an infection caused by an overgrowth of certain bacteria in the vagina. You can’t reliably get rid of it with home remedies alone. BV requires antibiotic treatment prescribed by a healthcare provider, and most people see the discharge clear up within a week of starting medication.
What Causes Grey Discharge
Your vagina naturally contains a mix of bacteria. Normally, beneficial bacteria called lactobacilli keep everything in balance by maintaining an acidic environment. When harmful bacteria multiply and outnumber the good ones, that balance tips, and the result is bacterial vaginosis.
The hallmark discharge is thin, greyish-white (sometimes with a greenish tint), and often has a noticeable fishy smell. It tends to coat the vaginal walls evenly rather than appearing in clumps. The odor is typically strongest after sex or during your period. Some people with BV have no symptoms at all, but grey discharge with that distinctive smell is the most recognizable combination.
A healthy vagina has a pH below 4.5. With BV, the pH rises above that threshold, creating an environment where harmful bacteria thrive even more. This is why the infection can feel self-perpetuating once it takes hold.
What Raises Your Risk
Douching is one of the biggest risk factors. It strips away the protective bacteria your vagina needs. Having new or multiple sexual partners and not using condoms also increase the likelihood of developing BV, though BV is not classified as a sexually transmitted infection. It can occur in people who have never had sex.
Hormonal shifts, scented soaps and body washes applied to the vulva, and even certain laundry detergents can contribute to the bacterial imbalance. Anything that disrupts the vagina’s natural acidity makes BV more likely.
How BV Is Diagnosed
A provider can usually diagnose BV during a standard pelvic exam. They look for at least three specific signs: thin, milklike discharge, a vaginal pH above 4.5, a fishy odor, and the presence of certain bacterial markers on a microscope slide. In many cases, the appearance and smell of the discharge alone make the diagnosis straightforward, but testing confirms it and rules out other infections like yeast or trichomoniasis, which require different treatments.
Antibiotic Treatment
BV is treated with prescription antibiotics, available as either an oral pill or a vaginal gel or cream. Both forms are effective, and your provider will recommend one based on your preferences and medical history. Treatment typically lasts five to seven days. Most people notice the discharge and odor improving within the first two to three days, but finishing the full course is important to clear the infection completely.
During treatment, avoid alcohol if you’re taking the oral antibiotic (it can cause severe nausea), and hold off on sex or use condoms until you’ve finished the medication. Some people experience mild side effects like stomach upset or a metallic taste with the oral version, while the vaginal formulations tend to have fewer systemic effects.
Why It Keeps Coming Back
Recurrence is one of the most frustrating aspects of BV. Many people find the discharge returns within a few months of treatment. This happens because the underlying bacterial balance hasn’t fully stabilized, or because the same triggers (a sexual partner’s microbiome, douching, irritating products) are still present.
For recurrent BV, providers sometimes prescribe a longer or extended treatment course to suppress the harmful bacteria over time. Boric acid vaginal suppositories (600 mg, used for 7 to 14 days) are sometimes recommended as a supplemental option, particularly for stubborn cases. These are available over the counter but should be used with provider guidance, not as a replacement for antibiotics during an active infection. Boric acid is toxic if swallowed and should only ever be used vaginally.
Do Probiotics Help?
The idea of restoring good bacteria with probiotics makes intuitive sense, but the evidence is mixed. A randomized controlled trial of 126 women tested whether taking oral probiotics containing two well-studied lactobacillus strains alongside antibiotics would improve cure rates compared to antibiotics alone. The 30-day cure rate was nearly identical in both groups: about 58% with probiotics and 60% without. At 90 days, the numbers dropped further, and the probiotic group still showed no advantage.
Some smaller studies have found more promising results, particularly with probiotics applied vaginally rather than taken orally. But right now, probiotics are not a proven standalone treatment for grey discharge. If you want to try them, use them alongside your prescribed antibiotic rather than instead of it.
How to Prevent Grey Discharge
The most effective prevention strategies target the root cause: keeping your vaginal bacteria balanced.
- Stop douching. Your vagina cleans itself. Douching washes away the protective bacteria and is one of the strongest risk factors for BV.
- Use condoms. Semen is alkaline and temporarily raises vaginal pH, which can promote bacterial overgrowth in some people.
- Avoid scented products near the vulva. Scented soaps, sprays, and bubble baths can irritate the vaginal lining and shift bacterial balance.
- Wear breathable underwear. Cotton underwear and loose-fitting clothing help keep the area dry, since moisture encourages bacterial growth.
When Grey Discharge Signals Something Serious
BV on its own is uncomfortable but not dangerous for most people. Left untreated, though, it raises the risk of more serious problems. BV is commonly present in people who develop pelvic inflammatory disease (PID), an infection of the uterus and fallopian tubes that can cause chronic pain and, in some cases, infertility. Even mild or symptom-free PID can damage reproductive organs.
During pregnancy, untreated BV is associated with preterm delivery and other complications. If you’re pregnant or planning to become pregnant and notice grey discharge, getting tested and treated promptly matters more than usual. Grey discharge that comes with pelvic pain, fever, or pain during sex could indicate the infection has spread beyond the vagina, and that warrants prompt medical attention.