Vaginal Discharge: Causes, Symptoms, and When to See a Doctor

Vaginal discharge is fluid produced by the vagina and cervix that helps keep the area clean and healthy. Normal discharge is usually clear or milky white with a mild odor. Changes in color (yellow, green, gray), consistency (thick, frothy, cottage cheese-like), or smell (fishy, foul), especially with itching or irritation, may indicate an infection. See a doctor if you notice these changes.

In plain words

Vaginal discharge is a fluid made by your body to keep the vagina clean and healthy. Normal discharge is usually clear or white and doesn't smell bad. It can change during your monthly cycle. When discharge looks different (like green, yellow, or gray), smells strong, or comes with itching or pain, it may mean you have an infection. Common infections include yeast infections (itchy, thick white discharge), bacterial vaginosis (gray, fishy smell), and trichomoniasis (frothy, greenish discharge). These need treatment from a doctor. Always see a doctor if your discharge changes in color, smell, or feel, especially if you also have pain, fever, or itching.

What is Vaginal Discharge: Causes, Symptoms, and When to See a Doctor?

Symptoms

Early symptoms

Clear or milky white discharge: Normal discharge is typically clear or white and may vary in consistency throughout the menstrual cycle. It usually has a mild, non-offensive odor and helps keep the vagina clean. (1) (3)
Increased discharge during ovulation: Discharge often becomes clearer, stretchier, and more abundant around ovulation, similar to egg white. This is a normal hormonal change. (6) (3)
Thick, white discharge (no itching): Some women normally have thicker, white discharge at certain times in their cycle, especially before or after menstruation. Without itching or odor, this is usually normal. (1) (6)
Mild odor with no irritation: Normal discharge may have a mild musky or slightly sweet odor that isn't unpleasant or strong. It shouldn't cause itching, burning, or discomfort. (3) (1)

Serious or emergency symptoms

Yellow, green, or gray discharge: Discharge with abnormal colors (yellow, green, gray) may indicate an infection such as bacterial vaginosis or trichomoniasis. Gray discharge with a fishy odor is typical of bacterial vaginosis. Schedule an appointment with your doctor for evaluation and possible testing. (2) (5)
Strong, foul, or fishy odor: A strong, unpleasant odor, especially after sex or during menstruation, may signal bacterial vaginosis or another infection. Fishy smell is particularly common with BV. See a healthcare provider for diagnosis, as this may require prescription treatment. (2) (7)
Thick, white, cottage cheese-like discharge with itching: This combination usually indicates a yeast infection. The discharge is often clumpy and accompanied by redness, swelling, or burning in the vaginal area. Over-the-counter antifungal treatments may help, but see a doctor if symptoms persist or recur. (4) (6)
Frothy, yellow-green discharge: Frothy, yellow-green discharge with a strong odor often points to trichomoniasis, a sexually transmitted infection that requires treatment. Seek medical care for testing and antibiotics. Sexual partners need treatment too. (5) (7)

Causes

Primary causes

Bacterial vaginosis (BV): An overgrowth of certain bacteria naturally present in the vagina. BV causes thin, grayish discharge with a strong fishy odor, especially after sex. It's not usually itchy. (2) (3)
Yeast infection: Overgrowth of Candida fungus leading to thick, white, cottage cheese-like discharge with itching and irritation. Common after antibiotics, during pregnancy, or with diabetes. (4) (6)
Trichomoniasis: A sexually transmitted infection caused by a parasite. Results in frothy, yellow-green discharge with a strong odor, along with itching and discomfort during urination. (5) (7)
Normal hormonal changes: Discharge naturally varies in amount and consistency across the menstrual cycle. Pregnancy, breastfeeding, and menopause also cause normal changes. (1) (6)

Risk factors

Multiple sexual partners or new partner

Having multiple sex partners or a new partner increases risk for sexually transmitted infections that can cause abnormal discharge, such as trichomoniasis. (7) (2)

Recent antibiotic use

Antibiotics can disrupt the natural balance of bacteria in the vagina, increasing risk for yeast infections and sometimes bacterial vaginosis. (4) (6)

Douching or vaginal sprays

These products disrupt the vagina's natural pH balance and protective bacteria, making infections more likely. The vagina cleans itself naturally. (2) (6)

Pregnancy or diabetes

Hormonal changes in pregnancy and elevated blood sugar in diabetes increase yeast infection risk. Pregnant women with abnormal discharge should see a doctor promptly. (4) (2)

Diagnosis

Doctors diagnose abnormal discharge based on symptoms, a pelvic exam, and sometimes lab tests. They may examine a sample of the discharge under a microscope or send it for culture. For suspected STIs, additional testing or screening may be needed. Be prepared to discuss your symptoms, menstrual cycle, sexual activity, and any recent antibiotic or medication use.

Pelvic examination

To visually inspect the discharge and check for signs of infection, inflammation, or other abnormalities in the vaginal area. (3) (6)

Wet mount (microscopic exam)

A sample of discharge is examined under a microscope to check for yeast, clue cells (sign of BV), or trichomoniasis parasites. (2) (7)

pH test

A simple test using pH paper can help distinguish between causes; bacterial vaginosis and trichomoniasis often raise vaginal pH while yeast infections usually don't. (2) (6)

STI testing

If trichomoniasis or other STIs are suspected, additional tests like nucleic acid amplification (NAAT) may be done on vaginal swabs or urine samples. (5) (7)

Treatment

Medication options

Antibiotics (for bacterial infections)

Kills overgrown bacteria causing bacterial vaginosis or parasites causing trichomoniasis. Available as oral pills or vaginal creams/gels. (2) (7)

Antifungals (for yeast infections)

Reduces fungal overgrowth causing yeast infections. Available as creams, suppositories, or oral tablets (for severe/recurrent cases). (4) (6)

Lifestyle and self-care

Avoid douching and scented products: Douching disrupts the vagina's natural balance. Avoid scented soaps, sprays, bubble baths, and feminine hygiene products that can cause irritation. (2) (3)
Wear breathable cotton underwear: Cotton underwear helps keep the area dry. Avoid tight-fitting pants or underwear that trap moisture, creating an environment where yeast and bacteria thrive. (4) (6)
Practice good hygiene: Wipe from front to back after using the toilet to avoid spreading bacteria from the anus to the vagina. Change out of wet swimsuits or workout clothes promptly. (6) (3)
Use protection during sex: Condoms reduce risk of sexually transmitted infections that can cause abnormal discharge. Discuss STI testing with new or multiple partners. (7) (5)

Always discuss dosing and treatment changes with your own prescriber.

Possible complications

Increased STI risk: Bacterial vaginosis and trichomoniasis increase susceptibility to other sexually transmitted infections, including HIV, by disrupting the vagina's natural protective barriers. (2) (7)
Pregnancy complications: Untreated BV or trichomoniasis during pregnancy may lead to premature birth, low birth weight, or increased risk of passing HIV to the baby if the mother is HIV-positive. (2) (5)
Pelvic inflammatory disease (PID): Rarely, untreated STIs causing discharge can spread to the uterus and fallopian tubes, leading to PID - a serious infection that may cause chronic pain or infertility. (7) (6)
Recurrent infections: Some women experience frequent yeast infections or BV that keep coming back, requiring longer treatment courses or maintenance therapy under a doctor's care. (4) (2)

When to see a doctor

Routine follow-up

Schedule an appointment if you notice persistent changes in discharge color (yellow, green, gray), consistency (thick, frothy, cottage cheese-like), or smell (fishy, foul). (3) (6)
See a doctor if you have vaginal itching, burning, redness, or pain along with abnormal discharge, or if symptoms don't improve with over-the-counter yeast treatment. (4) (8)

Seek emergency care

Seek urgent care if you develop fever, severe pelvic pain, or nausea/vomiting along with abnormal discharge - these may indicate a more serious infection requiring prompt treatment. (8) (6)

Frequently asked questions

What is normal vaginal discharge?

Normal discharge is usually clear or milky white, with a mild odor. It may be thin or stretchy at ovulation and thicker at other times. The amount varies naturally and increases during pregnancy, ovulation, and sexual arousal. (1) (3)

When should I worry about vaginal discharge?

See a doctor for discharge that's yellow, green, gray, or frothy; has a strong or fishy odor; or comes with itching, burning, pain, or pelvic discomfort. These often signal an infection needing treatment. (8) (6)

Can vaginal discharge be a sign of an STD?

Yes, some STDs like trichomoniasis, gonorrhea, and chlamydia cause abnormal discharge. Trichomoniasis typically causes frothy, yellow-green discharge with a strong odor. Get tested if you're sexually active with new or multiple partners. (5) (7)

How can I tell if I have a yeast infection?

Yeast infections usually cause thick, white, clumpy discharge (like cottage cheese) with intense itching, redness, and sometimes burning during urination or sex. Over-the-counter antifungals often help, but see a doctor if symptoms persist. (4) (6)

Is it normal to have discharge every day?

Yes, most women have some daily discharge, which is how the vagina cleans itself. Amount varies by individual and changes throughout the menstrual cycle. Only significant changes in color, odor, or accompanying symptoms require medical attention. (1) (3)

References

CDC — Vaginal Discharge source 1
CDC — Bacterial Vaginosis Fact Sheet source 2
NHS — Vaginal Discharge source 3
NHS — Thrush in Men and Women source 4
NHS — Trichomoniasis source 5
MedlinePlus — Vaginal Discharge source 6
CDC — Trichomoniasis Fact Sheet source 7
NHS — When to Get Medical Help source 8