Vaginal discharge is a fluid your body produces to keep the vagina clean and protected from infection. It’s made up of a mix of cervical mucus, old cells shed from the vaginal walls, healthy bacteria, and proteins from vaginal fluid. On average, the body produces less than one teaspoon of it per day, though the amount fluctuates depending on where you are in your menstrual cycle, whether you’re pregnant, and your age.
What Discharge Is Made Of
Discharge isn’t a single substance. It’s a combination of fluids from different sources inside the reproductive tract. The cervix (the narrow opening at the base of the uterus) produces mucus that varies in thickness throughout the month. The walls of the vagina shed old cells continuously, and those cells get swept into the fluid. Colonies of beneficial bacteria, primarily Lactobacillus species, live in the vagina and contribute to the mix. These bacteria produce lactic acid and hydrogen peroxide, which keep the vaginal environment slightly acidic, with a pH between 3.8 and 4.5. That acidity makes it difficult for harmful bacteria and yeast to take hold.
The fluid itself also contains immune proteins, including several types of immunoglobulins, which are antibodies that help fight off pathogens. So discharge isn’t waste or a sign that something is wrong. It’s an active defense system.
How It Keeps the Vagina Healthy
The vagina is a self-cleaning organ, and discharge is the mechanism it uses to do that job. The fluid flushes out dead cells, excess bacteria, and other material the body no longer needs. Think of it like a slow, continuous rinse cycle. This is why gynecologists generally advise against douching or using internal cleansing products. The vagina is already handling it, and interfering with that process can disrupt the bacterial balance and raise your risk of infection.
How Discharge Changes Throughout Your Cycle
The look and feel of discharge shifts predictably across the menstrual cycle, driven mainly by estrogen and progesterone levels.
In the days right after your period, discharge tends to be dry or pasty, often white or slightly yellow. As you move closer to ovulation, estrogen rises and the cervix responds by producing more mucus. The discharge becomes wetter, more slippery, and stretchy, often compared to raw egg whites. This “egg-white” consistency is the most fertile type of cervical mucus, designed to help sperm travel more easily.
After ovulation, estrogen drops and progesterone takes over. Discharge thickens again and becomes drier, sometimes sticky or tacky in texture. This pattern repeats each cycle. If you track your discharge over a few months, you’ll likely notice the rhythm.
Discharge During Pregnancy
During pregnancy, rising estrogen levels and increased blood flow to the pelvic area cause a noticeable increase in discharge. This pregnancy-related discharge is sometimes called leukorrhea. It’s typically thin, white or milky, with a mild odor, and it may feel slippery or mucus-like as the pregnancy progresses. The increase serves the same purpose as always: clearing away dead cells and maintaining a healthy bacterial balance, which becomes especially important when protecting a developing pregnancy from infection.
What Changes After Menopause
After menopause, estrogen levels drop significantly, and that changes the vaginal environment in several ways. The amount of discharge decreases, sometimes substantially. The vaginal walls become thinner and drier, a condition known as vaginal atrophy. The acid balance also shifts, with pH rising above 4.5, which can make the vagina more vulnerable to infections it previously fended off easily. Some people notice an unusual yellowish discharge during this time. These changes are a direct result of lower estrogen and are common, not a sign of poor hygiene or disease.
What Normal Discharge Looks Like
Healthy discharge is clear, milky white, or off-white. It can range from thin and watery to thick and sticky depending on where you are in your cycle. It may have a mild scent, but it shouldn’t smell strongly unpleasant. A slight yellowish tint on underwear after it dries is also normal, since the proteins in discharge can oxidize when exposed to air.
The volume varies from person to person. Some people barely notice their discharge, while others produce enough to leave a visible mark on their underwear every day. Both ends of that range can be perfectly healthy.
Signs That Something Is Off
The color, texture, and smell of discharge are reliable signals when something has changed in the vaginal environment. Here are the patterns most commonly linked to specific infections:
- Thick, white, cottage cheese-like texture with itching: This is the hallmark of a yeast infection. The discharge is usually odorless or mild-smelling, but the itching and irritation are hard to miss.
- White or gray with a fishy smell: Bacterial vaginosis (BV) produces this type of discharge. The smell often becomes more noticeable after sex.
- Green, yellow, or gray and bubbly or frothy: Trichomoniasis, a sexually transmitted infection caused by a parasite, typically produces this kind of discharge.
- Cloudy, yellow, or green discharge: Gonorrhea and chlamydia can both cause this, though many people with these infections have no noticeable discharge changes at all.
Dark yellow, brown, green, or gray discharge generally signals that something needs attention. The same goes for any discharge that’s chunky or foamy, or that comes with itching, burning, or a strong odor that’s new for you. A shift in pH above 4.5 is common in both BV and trichomoniasis, which is one reason these infections disrupt the normal feel and smell of discharge so noticeably.
The key is knowing your own baseline. Everyone’s discharge looks a little different, so the most useful warning sign isn’t a specific color on a chart. It’s a change from what’s normal for you.