White discharge causes and treatment

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White Vaginal Discharge: Causes and Treatment

White vaginal discharge (medically called leukorrhea) can be normal (physiological) or a sign of infection or another condition. The color, consistency, smell, and associated symptoms help distinguish the cause.

Normal (Physiological) Discharge

Normal vaginal secretions are white or clear, floccular in consistency, and located mainly in the posterior fornix. They increase at:

Mid-cycle (ovulation) due to increased cervical mucus
During pregnancy
With sexual arousal

The normal vaginal pH is <4.5, maintained by lactic acid from lactobacilli. This discharge requires no treatment.

Berek & Novak's Gynecology, p. 806

Pathological Causes

1. Bacterial Vaginosis (BV) - Most Common Cause

What it is: A polymicrobial syndrome involving loss of normal hydrogen peroxide-producing lactobacilli and overgrowth of anaerobes (Gardnerella vaginalis, Mycoplasma hominis, and others). BV is the most common cause of abnormal vaginal discharge in the United States.

Symptoms:

Thin, white-gray, homogeneous discharge
Fishy odor (worse after intercourse or with KOH - the "whiff test")
Vaginal pH >4.5
Clue cells on wet mount (vaginal epithelial cells with adherent bacteria, obscuring cell borders)
Often asymptomatic

Associated risks: Increased risk of PID, premature rupture of membranes, preterm delivery, and acquisition of HIV and other STIs.

Treatment:

Regimen	Dose
Metronidazole (oral)	500 mg twice daily x 7 days
Metronidazole gel 0.75%	5 g intravaginally once daily x 5 days
Clindamycin cream 2%	5 g intravaginally at bedtime x 7 days

Treatment of male sexual partners is not beneficial for BV
Intravaginal Lactobacillus / probiotic preparations have no proven benefit
Pregnant women can use the same oral or topical regimens
Rosen's Emergency Medicine, p. 1385; Harrison's Principles 22E

2. Vulvovaginal Candidiasis (VVC) - "Yeast Infection"

What it is: Caused predominantly by Candida albicans (85-90% of cases). An estimated 75% of women have at least one episode in their lifetime. Predisposing factors include:

Antibiotic use (disrupts normal flora)
Pregnancy
Diabetes mellitus
Immunosuppression (HIV, steroids)

Symptoms:

Thick, white, cottage-cheese-like or curdy vaginal discharge
Intense vulvar itching (pruritus) - the hallmark symptom
Vulvar erythema and edema
Dyspareunia and external dysuria ("splash dysuria")
Vaginal pH usually <4.5 (helps distinguish from BV)
KOH wet mount shows budding yeast or pseudohyphae

Classification:

Uncomplicated	Complicated
Sporadic/infrequent	Recurrent (≥4 episodes/year)
Mild to moderate symptoms	Severe symptoms
Likely C. albicans	Non-albicans Candida
Immunocompetent	Diabetic, HIV, immunosuppressed

Treatment:

Uncomplicated: Single-dose fluconazole 150 mg orally (highly effective, not for pregnancy) OR topical azoles (clotrimazole, miconazole, butoconazole, terconazole, tioconazole) - many available over the counter
Pregnancy: 7-day course of topical azoles (fluconazole contraindicated)
Recurrent VVC: Prolonged antifungal therapy; weekly fluconazole maintenance for 6 months
Treating male partners is not routinely recommended
Rosen's Emergency Medicine, p. 1385; Berek & Novak's Gynecology, p. 811

3. Trichomoniasis

What it is: Caused by Trichomonas vaginalis, a sexually transmitted protozoan.

Symptoms:

Profuse, yellow-green, frothy or purulent discharge (can appear white)
Vulvar irritation and pruritus
Vaginal pH ≥5
Strawberry cervix (petechial lesions, best seen by colposcopy)
Motile trichomonads on saline wet mount

Treatment:

Metronidazole: A 7-day course is preferred over single 2 g dose for better efficacy
Tinidazole is an alternative (longer half-life, fewer GI side effects; useful in metronidazole-resistant cases)
Treating sexual partners is mandatory (prevents reinfection)
Intravaginal metronidazole gel is not reliable for trichomoniasis - systemic treatment is required
Harrison's Principles 22E

4. Cervicitis

May cause mucopurulent discharge from the cervix
Common causes: Chlamydia trachomatis, Neisseria gonorrhoeae
Often asymptomatic - majority of chlamydial and gonococcal infections produce no symptoms
Commonly associated with bacterial vaginosis; treating both simultaneously improves outcomes
Treatment: Doxycycline (chlamydia), Ceftriaxone (gonorrhea)

5. Other Causes

Cause	Key Feature
Atrophic vaginitis	Postmenopausal; thin, pale discharge; treated with topical estrogen
Inflammatory vaginitis	No specific organism; purulent discharge with many WBCs
Vaginal foreign body	Foul-smelling discharge; common in children (toilet paper most common)
Physiologic neonatal discharge	Normal in first 2-3 weeks of life; no treatment needed

Quick Diagnostic Comparison

Feature	Normal	BV	Candidiasis	Trichomoniasis
Color	White/clear	White-gray	White	Yellow-green
Consistency	Floccular	Thin, homogeneous	Thick, curdy	Frothy
Odor	None	Fishy	None	Foul
pH	<4.5	>4.5	<4.5	≥5
Microscopy	Normal cells	Clue cells	Yeast/pseudohyphae	Motile trichomonads
Itch	No	Usually not	Yes (prominent)	Variable

When to See a Doctor

See a clinician promptly if you notice:

Discharge with strong fishy or foul odor
Yellow, green, or gray discoloration
Pelvic pain or fever (possible PID)
Discharge with unusual texture or large volume
Symptoms during pregnancy
Recurrent episodes that don't respond to over-the-counter treatment

A recent systematic review and network meta-analysis (2024, PMID 39463760) confirmed metronidazole as a first-line agent for BV, with no major changes to current treatment guidelines.

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