Yeast Infections in Pregnancy: Risk, Diagnosis, and Why It's Not a Pregnancy Sign

Vulvovaginal candidiasis (VVC) is more common in pregnancy due to hormonal changes, but its presence does not diagnose pregnancy.

Why Pregnancy Increases Risk

• High estrogen → ↑ glycogen in vaginal epithelium → Candida proliferation.
• Immune modulation (Th2 shift) → reduced fungal clearance.
• Altered vaginal pH, glucose in secretions.

Diagnosis

• Symptoms: pruritus, burning, thick white "cottage cheese" discharge, dyspareunia, external erythema.
• Confirm: KOH prep (hyphae/pseudohyphae), culture if recurrent/resistant.
• Rule out: BV, trichomoniasis, STIs, contact dermatitis.

Treatment in Pregnancy

• Topical azoles (7‑day course): Clotrimazole, miconazole, terconazole — safe and recommended (CDC, ACOG).
• Avoid oral fluconazole — teratogenic risk (especially 1st trimester, high dose).
• Probiotics (oral/vaginal Lactobacillus) may reduce recurrence.

Key Distinction

A yeast infection is not a sign of pregnancy. Many non‑pregnant women get VVC (antibiotics, diabetes, OCPs, immunosuppression). If pregnancy is possible, take a pregnancy test—do not rely on yeast symptoms.

Prevention

• Cotton underwear, avoid tight synthetics.
• Limit sugar/refined carbs.
• Probiotic‑rich foods (yogurt, kefir).
• Promptly change wet swimwear/workout clothes.

VVC in pregnancy is common, treatable, and not a pregnancy test substitute.