A noticeable increase in vaginal discharge is usually normal. The vagina produces an average of 2.5 to 5 milliliters of discharge per day (roughly half to one teaspoon), but that amount shifts constantly based on where you are in your menstrual cycle, whether you’re pregnant, what birth control you use, and even whether you’re sexually aroused. In most cases, more discharge simply means your body is responding to a hormonal shift. But certain changes in color, smell, or texture can point to an infection worth treating.
Your Menstrual Cycle Is the Biggest Factor
The volume and texture of vaginal discharge change predictably throughout a 28-day cycle, driven primarily by estrogen levels. Right after your period ends, discharge tends to be minimal and dry or tacky. Over the following days it gradually becomes sticky, then creamy with a yogurt-like consistency. Around days 10 to 14, as you approach ovulation, discharge peaks in volume and becomes slippery, wet, and stretchy, resembling raw egg whites. This fertile-window mucus lasts about three to four days and exists for a biological reason: its slippery texture helps sperm travel through the uterus.
After ovulation, estrogen drops and progesterone rises, causing discharge to dry up again until your next period. So if you’re noticing a sudden increase in discharge, check where you are in your cycle. Mid-cycle surges are one of the most common explanations.
Pregnancy and Hormonal Birth Control
Pregnancy triggers a sustained increase in discharge that can feel dramatic compared to your pre-pregnancy baseline. The placenta produces high levels of estrogen, which stimulates more secretion from the vaginal lining. This milky, mild-smelling discharge (sometimes called leukorrhea) is a normal part of pregnancy and tends to increase as the pregnancy progresses. The same hormonal changes also thin the vaginal lining, which creates more surface area for fluid production.
Hormonal contraceptives can have a similar effect. Hormonal IUDs work locally inside the uterus by thickening cervical mucus so sperm can’t travel well, and all that extra mucus often shows up as increased vaginal discharge. Other forms of hormonal birth control, like pills or the patch, prevent ovulation but can still cause watery discharge due to hormonal changes in the cervix and vagina. If you recently started or switched contraceptives and noticed more discharge, that’s a likely explanation.
Sexual Arousal and Physical Activity
Sexual arousal causes a temporary but noticeable spike in vaginal fluid. During arousal, blood flow increases to the vaginal walls, which causes moisture to pass through the tissue (a process called transudation). At the same time, small glands near the vaginal opening swell and secrete lubricating fluid. Some people also produce a milk-like substance during orgasm. All of this fluid is separate from your baseline daily discharge, so days that involve sexual arousal will naturally feel wetter.
Signs That Discharge May Signal an Infection
Normal discharge ranges from clear to white and has a mild scent or no odor at all. When the volume increase comes with a change in color, texture, or smell, an infection is worth considering. The three most common culprits each have a distinctive pattern.
Bacterial Vaginosis
Bacterial vaginosis (BV) is the most common vaginal infection in reproductive-age women. It produces a thin, grey-white discharge with a fishy odor that often gets stronger after sex. BV happens when the balance of bacteria in the vagina shifts, allowing certain species to overgrow. The vaginal pH rises above its normal acidic range (above 4.5), which contributes to the characteristic smell. BV isn’t sexually transmitted, but it does require treatment to clear up.
Yeast Infections
A yeast infection produces thick, white discharge that looks like cottage cheese. It’s usually accompanied by intense itching, redness, and sometimes a burning sensation during urination or sex. Unlike BV, yeast infections typically don’t have a strong odor. They’re caused by an overgrowth of a fungus that naturally lives in the vagina, often triggered by antibiotics, high blood sugar, or a weakened immune system.
Trichomoniasis
Trichomoniasis is a sexually transmitted infection that causes a clear, yellowish, or greenish discharge that may be thin or frothy, often with a fishy smell. It can also cause itching, burning, and soreness. Many people with trichomoniasis have no symptoms at all, so an increase in unusually colored or smelly discharge is sometimes the only clue.
What Warrants a Closer Look
An increase in volume alone, without changes in color, odor, or texture, is rarely a sign of a problem. But certain combinations of symptoms point to something that needs attention:
- A fishy or foul smell that persists or worsens after sex suggests BV or trichomoniasis.
- Green, yellow, or grey discharge that looks different from your usual pattern may indicate an infection.
- Cottage cheese texture with itching is a classic yeast infection presentation.
- Pelvic pain or fever alongside increased discharge can signal a more serious infection involving the cervix or upper reproductive tract.
- Discharge that persists despite treatment or keeps coming back may need further evaluation, including testing for less common causes.
A medical history alone isn’t enough to accurately diagnose the cause of abnormal discharge, since BV, yeast infections, and STIs can look similar on the surface. A physical exam and lab testing provide the most reliable answers.