Vaginal Discharge: Normal or Infection?

Vaginal discharge is a natural part of the female reproductive system, and in the great majority of cases it is entirely normal. The vagina and cervix produce daily secretions that cleanse the tract, maintain moisture balance, and form a protective barrier against infection. However, when the colour, odour, amount, or consistency of the discharge changes — or when itching, burning, or pain is present — an underlying infection or hormonal disturbance may be responsible.

This article reviews the features of normal vaginal discharge, which findings warrant a medical consultation, the most common infectious causes (yeast, bacterial vaginosis, trichomoniasis), diagnostic methods, and treatment options.

Characteristics of normal vaginal discharge

• Colour: clear, milky-white, or pale cream; may appear slightly yellowish once dry.
• Odour: odourless or very mild and inoffensive.
• Consistency: varies with the menstrual cycle; clear and stretchy (egg-white–like) around ovulation, thicker and creamier at other times.
• Amount: variable between women; approximately 1–4 mL per day is normal.
• No accompanying symptoms: no itching, burning, redness, pain, or discomfort during intercourse.

Physiological factors that increase discharge

An increase in discharge is normal in the following situations:

• Ovulation: discharge becomes more abundant, clearer, and takes on the egg-white consistency mid-cycle.
• Sexual arousal: increased lubricating secretion.
• Pregnancy: higher oestrogen and blood flow lead to a marked increase in discharge (leucorrhoea). White, odourless, and non-itchy discharge is normal.
• Hormonal contraceptives: may influence the amount of discharge.
• Stress and fatigue: can affect hormonal balance and therefore discharge.

Abnormal discharge: when to be concerned

The following findings suggest that discharge is not normal and require medical evaluation:

• Yellow, green, grey, or frothy discharge
• Foul, fishy, or yeasty odour
• Cottage-cheese–like, cheesy discharge
• Itching, burning, redness, or swelling
• Pain on urination or during intercourse
• Bloody or pink discharge outside menstruation
• Lower abdominal pain or fever

Most common causes

1. Yeast infection (vulvovaginal candidiasis)

Vaginal yeast infection is most often caused by overgrowth of Candida albicans. Approximately 75% of women experience at least one episode during their lifetime.

Typical findings:

• White, cottage-cheese–like discharge
• Notably little odour (or a mild yeasty smell)
• Intense itching, burning, and redness
• Burning on urination and during intercourse

Risk factors: antibiotic use, pregnancy, diabetes, immunosuppression, tight or non-breathable underwear, and prolonged wear of wet swimwear or workout clothing.

2. Bacterial vaginosis (BV)

Bacterial vaginosis develops when the natural balance of vaginal bacteria is disrupted — lactobacilli decrease and anaerobic bacteria overgrow. It is not classically a sexually transmitted infection, but sexual activity increases its frequency.

Typical findings:

• Grey-white, thin, watery discharge
• A prominent fishy odour (particularly after intercourse and during menstruation)
• Itching and burning are usually mild or absent

Untreated BV can increase the risk of preterm birth, low birth weight, and pelvic inflammatory disease in pregnancy.

3. Trichomoniasis

A sexually transmitted infection caused by the parasite Trichomonas vaginalis.

Typical findings:

• Yellow-green, frothy, profuse discharge
• Foul-smelling discharge
• Intense itching, burning, and redness
• Pain on urination and discomfort during intercourse
• Some women remain asymptomatic

Concurrent treatment of the partner is mandatory.

4. Cervicitis (inflammation of the cervix)

Sexually transmitted infections such as chlamydia and gonorrhoea can cause cervicitis. Findings include yellow-green, foul-smelling discharge — sometimes blood-tinged — postcoital spotting, and lower abdominal pain. Untreated cervicitis can spread to the fallopian tubes, causing tubal obstruction and infertility.

5. Atrophic vaginitis (postmenopausal)

Postmenopausal oestrogen decline thins the vaginal mucosa and increases dryness and sensitivity. Watery, yellow, or blood-tinged discharge, burning, and pain during intercourse may occur. Local oestrogen therapy usually provides substantial relief.

6. Foreign body

A retained tampon, condom fragment, or other foreign body can cause a foul-smelling brown-greenish discharge. It is quickly identified on examination.

Quick guide by colour and odour

• Clear / white, odourless: generally normal.
• Cottage-cheese–like, itchy: yeast infection.
• Grey, fishy odour: bacterial vaginosis.
• Yellow-green, frothy, foul-smelling: trichomoniasis or cervicitis.
• Brown: usually old blood — normal at the start or end of menstruation; otherwise needs evaluation.
• Pink / bloody: outside menstruation, always consult a physician.

How is the diagnosis made?

The examination begins with inspection of the external genital area and vagina, followed by cervical visualisation with a speculum. A sample of the discharge can be examined with the following tests:

• Wet mount microscopy: may show fungal hyphae, clue cells (BV), or motile trichomonads.
• pH measurement: normal vaginal pH is 3.8–4.5. BV and trichomoniasis raise the pH above 4.5.
• Whiff (amine) test: in BV, adding KOH releases a sharp fishy odour.
• Culture or PCR: when resistant yeast, chlamydia, or gonorrhoea is suspected.
• Cervical smear / HPV testing: part of the assessment when chronic discharge or spotting is present.

Treatment

Yeast infection

Treated with a single dose or short course of oral antifungals, or with topical vaginal pessaries or creams. Recurrent infections may require longer suppressive therapy.

Bacterial vaginosis

Metronidazole or clindamycin — oral tablets or a vaginal gel or cream. Alcohol should be avoided during the course of treatment.

Trichomoniasis

A single dose or 7-day course of oral metronidazole or tinidazole. Concurrent partner treatment and abstinence from unprotected intercourse until treatment is complete are essential.

Chlamydia / gonorrhoea

Appropriate antibiotics (e.g. azithromycin, doxycycline, or ceftriaxone) are prescribed. Partner treatment and screening for other sexually transmitted infections (HIV, syphilis, hepatitis) are recommended.

Tips for vaginal health

• Do not douche: it disrupts the natural flora and increases the risk of BV and yeast infection.
• Avoid perfumed products: scented soaps, wet wipes, pads, and tampons are irritating.
• Prefer cotton underwear; avoid tight, synthetic clothing.
• Do not remain in wet swimwear or workout clothing for long periods.
• Wipe from front to back after using the toilet.
• Change pads or tampons every 4–6 hours during menstruation.
• Avoid unprotected intercourse; condoms provide the most effective protection against sexually transmitted infections.
• After antibiotic use, a probiotic can be considered on your doctor's advice to help restore vaginal balance.

Frequently asked questions

Does every infection cause itching?

No. Itching is prominent in yeast infection but is often absent in bacterial vaginosis. For this reason, self-diagnosis based on symptoms alone and treating with over-the-counter products can be misleading.

Should I worry about increased discharge during pregnancy?

Increased discharge is normal in pregnancy. However, foul-smelling, yellow-green, itchy discharge or watery or bloody discharge must always be evaluated. A gush of watery fluid may indicate rupture of the membranes and preterm labour.

If it is not sexually transmitted, why should my partner be treated?

Yeast infection and bacterial vaginosis are not classical STIs and partner treatment is usually unnecessary. However, in trichomoniasis, chlamydia, and gonorrhoea, concurrent partner treatment is mandatory — otherwise the infection will recur.

I have recurrent yeast infections — what should I do?

Four or more episodes per year is defined as recurrent vulvovaginal candidiasis. Assessment for underlying diabetes, immunosuppression, and resistant species may be required, along with prolonged suppressive therapy.

Isn't douching good for hygiene?

No. The vagina is self-cleaning. Douching disrupts the natural flora and increases the risk of infection; it has also been associated with pelvic inflammatory disease and ectopic pregnancy. Warm water and, if desired, pH-balanced, unscented cleansers on the external genitalia are sufficient.

Assessment in Adana

Most women presenting with vaginal discharge are managed with a simple examination and a short course of treatment. Recurrent infections, atypical discharge, pregnancy-related changes, and suspicion of a sexually transmitted infection should always be evaluated by an obstetrician-gynaecologist. For diagnosis and treatment of vaginal discharge, recurrent yeast or bacterial vaginosis, and sexually transmitted infections in Adana, you can consult Op. Dr. Sadık Kükrer.