You've probably heard the word "dysbiosis" tossed around in gut health conversations. It applies to the vagina too, and it's actually a bit easier to understand there.

The Simple Definition

Dysbiosis just means imbalance. Specifically, it's when the usual Lactobacillus-dominant environment shifts, and other types of bacteria start growing more than they normally would.

In a typical, balanced vagina, Lactobacillus keeps things acidic and relatively low in bacterial diversity. In dysbiosis, that dominance breaks down. Diversity increases, pH tends to rise, and bacteria that would normally be kept in check, like Gardnerella, may start to overgrow.

It's worth noting this isn't automatically an infection. Dysbiosis describes the imbalance itself. Whether it turns into something like bacterial vaginosis (BV) or another condition depends on how the imbalance plays out, and how the body responds.

What Might Cause It

Researchers have identified several factors that seem to increase the likelihood of vaginal dysbiosis. None of these guarantee it will happen, they're more like things that can tip the balance:

• Antibiotic use, since antibiotics can't always tell the difference between harmful bacteria and helpful ones

• Douching, which can strip away the acidic, protective environment Lactobacillus works to maintain

• Smoking, which has been associated with a higher likelihood of BV in some studies

• New or multiple sexual partners, which may introduce new bacteria into the environment

• Hormonal shifts, like those during your period, postpartum, or menopause, since estrogen plays a direct role in supporting Lactobacillus

• High-sugar or high-glycemic diets, which some research has linked to increased oxidative stress and BV risk

What It Might Feel Like

Dysbiosis itself doesn't always come with obvious symptoms. Research suggests a meaningful number of women with a dysbiotic vaginal microbiome don't notice anything unusual at all.

When symptoms do show up, they can include:

• A change in discharge, sometimes described as thin, gray, or increased in amount

• An unusual odor, often described as fishy, especially after sex

• Itching or irritation

• A change in vaginal pH, which isn't something you'd notice directly, but is part of what's happening internally

These are signs worth paying attention to, not something to self-diagnose from. Similar symptoms can point to a few different things, including BV, yeast infections, or other causes, and testing is really the only way to know what's actually going on.

Why It's Worth Addressing, Not Ignoring

Vaginal dysbiosis is fairly common, and on its own isn't something to panic about. But research has connected ongoing, unaddressed dysbiosis to a higher likelihood of certain complications, including a greater risk for other infections and, in pregnancy specifically, potential risks like preterm birth.

This is part of why providers tend to take vaginal symptoms seriously, even when they seem minor. Catching an imbalance early is generally easier to manage than letting it persist.

What May Help Support Balance

• Avoiding douching or unnecessary vaginal washes, which can disrupt the acidic environment

• A fiber-rich, lower-sugar diet, which has been associated with better vaginal microbiome outcomes in some studies

• Being thoughtful about antibiotic use when possible, and talking to a provider about support during and after a course of antibiotics

• Considering a Lactobacillus-specific probiotic studied for vaginal health, rather than a general gut probiotic

• Getting tested rather than guessing, since treatment differs depending on the actual cause

---

Disclaimer: This article is for informational purposes only and is not medical advice. It is not intended to diagnose, treat, cure, or prevent any disease. Please consult a healthcare provider with questions about your individual health.