Discharge is a normal bodily function, but changes in color, texture, or smell can signal an infection, hormonal shift, or irritation. Most vaginal discharge is completely healthy: clear, milky white, or off-white fluid that your body produces every day to keep tissue clean and lubricated. Penile discharge, on the other hand, is almost always a sign that something needs attention. Here’s a breakdown of the most common causes for both.
Normal Discharge and Your Menstrual Cycle
Healthy vaginal discharge changes throughout your cycle in predictable ways. In the days right after your period ends, it tends to be dry or tacky and white or slightly yellow. Around days 7 to 9, it becomes creamy with a cloudy, yogurt-like consistency. Then, as you approach ovulation (roughly days 10 to 14), discharge gets slippery, stretchy, and clear, resembling raw egg whites. After ovulation, it dries up again until your next period.
The volume varies from person to person, and it also increases during pregnancy, when using hormonal birth control, and around ovulation. A healthy vagina maintains a pH between 3.8 and 4.5, which is moderately acidic. That acidity keeps harmful bacteria in check and is part of why discharge exists in the first place.
Bacterial Vaginosis
Bacterial vaginosis (BV) is the most common vaginal condition in women ages 15 to 44. It happens when the balance of bacteria in the vagina shifts, allowing certain types to overgrow. Not everyone with BV has symptoms, but when they appear, they typically include a thin white or gray discharge with a strong fishy odor, especially after sex. You might also notice burning when you pee or itching around the outside of the vagina.
BV is not a sexually transmitted infection, though sexual activity can increase the risk. Douching is another common trigger because it disrupts the natural bacterial balance. BV is treatable with prescription medication, and it’s worth getting checked because untreated BV can increase susceptibility to other infections.
Yeast Infections
Yeast infections produce a thick, white discharge that looks like cottage cheese. Unlike BV, yeast infections typically have little or no odor. The hallmark symptoms are intense itching, redness, and soreness around the vulva and vagina, sometimes with burning during urination or sex.
Several things can tip the balance in favor of yeast overgrowth:
- Antibiotics, which kill the healthy bacteria that normally keep yeast populations small
- Pregnancy, due to hormonal changes
- Poorly managed diabetes, since elevated blood sugar feeds yeast
- A weakened immune system, whether from illness or medications like corticosteroids
- Hormonal birth control or hormone therapy that raises estrogen levels
Over-the-counter antifungal treatments work for most uncomplicated yeast infections. If you’re getting them frequently (four or more times a year), that pattern is worth discussing with a healthcare provider, as it may point to an underlying issue like uncontrolled blood sugar.
Sexually Transmitted Infections
Several STIs cause noticeable changes in discharge. The characteristics differ depending on the infection, which is why lab testing matters more than guessing based on appearance alone.
Trichomoniasis produces a thin discharge that can be clear, white, yellowish, or greenish, often with a fishy smell. It also causes itching, burning, redness, and discomfort when urinating. Trichomoniasis affects both men and women. In men, it can cause irritation inside the penis, burning after urination or ejaculation, and penile discharge.
Chlamydia and gonorrhea are the two most common STIs associated with abnormal discharge. Both can cause increased or discolored vaginal discharge in women and penile discharge in men, though many people with chlamydia in particular have no symptoms at all. That’s part of what makes routine screening important if you’re sexually active with new partners.
Chemical Irritants and Allergic Reactions
Sometimes discharge isn’t caused by an infection but by your skin reacting to something it’s in contact with. Vulvar dermatitis is inflammation of the skin around the vulva, and it can produce a wet feeling from fluid seeping through damaged skin. The list of potential irritants is surprisingly long:
- Soaps, bubble bath, and shampoo that run down during a shower
- Laundry detergent and dryer sheets
- Pads, panty liners, and tampons
- Deodorants, perfumes, and douches
- Synthetic underwear (nylon in particular)
- Spermicides
- Tea tree oil and other “natural” remedies applied directly to the area
If your symptoms started after switching products, that’s a strong clue. The fix is usually straightforward: remove the irritant, switch to fragrance-free products, and wear cotton underwear. Symptoms typically resolve within days once the trigger is gone.
Hormonal Changes and Menopause
Estrogen plays a major role in vaginal health. It keeps the vaginal lining thick, moist, and well-supplied with blood flow. When estrogen drops, particularly during and after menopause, the tissue becomes thinner, drier, and more easily irritated. This condition, called vaginal atrophy, affects a significant number of postmenopausal women.
The first sign is often less lubrication, which you may notice during sex. Over time, the vaginal lining can become inflamed, and the area may take on a whitish discoloration. Some women experience a watery discharge or spotting. These changes also shift the vaginal pH upward, which can make you more vulnerable to infections like BV. Estrogen-based treatments applied locally can help restore the tissue, and non-hormonal moisturizers can ease day-to-day dryness.
Penile Discharge
Unlike vaginal discharge, penile discharge beyond pre-ejaculate or semen is not a normal daily occurrence. The most common cause is urethritis, an inflammation of the tube that carries urine out of the body. Typical symptoms include discharge from the tip of the penis, itching or tingling, and burning during urination.
The usual culprits are chlamydia and gonorrhea. Less common infectious causes include trichomoniasis, certain viruses, and a bacterium called Mycoplasma genitalium, which is increasingly recognized as a significant cause of urethral inflammation. Non-infectious causes are less well understood but can include irritation from harsh soaps, spermicides, vigorous friction, or even carbonated beverages irritating the urinary tract. If you notice any penile discharge that isn’t related to arousal or ejaculation, testing is the right next step since most causes are easily treatable once identified.
Colors That Signal a Problem
Healthy discharge is clear, milky white, or off-white. When it shifts to other colors, that’s your body flagging a change worth paying attention to. Gray or white with a fishy odor points toward BV. Thick and white like cottage cheese suggests yeast. Yellow or green, especially with a bad smell, raises the possibility of trichomoniasis or another STI. Pink or brown discharge outside of your period can indicate spotting from hormonal changes, irritation, or occasionally something that needs further evaluation.
No color chart is a substitute for testing. Many infections overlap in how they look, and some produce no visible changes at all. What matters most is noticing when something is different from your personal baseline, whether that’s the color, amount, texture, or smell.