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Vaginal Candidiasis (Yeast Infection)

Overview

Vaginal candidiasis, commonly called a yeast infection, is an over‑growth of the fungus Candida—most often Candida albicans—in the vaginal canal. While Candida naturally lives in small numbers on the skin, mouth, gastrointestinal tract, and vagina, changes in the environment can allow it to multiply and cause symptoms.

Who it affects: Up to 75 % of women will experience at least one episode in their lifetime, and roughly 40–45 % will have recurrent infections (four or more episodes per year). The condition can occur at any age after puberty, but it is most common in women of reproductive age (18‑45 years). Men can also develop genital candidiasis, though it is less frequent and often secondary to a partner’s infection.

Prevalence: According to the Centers for Disease Control and Prevention (CDC), approximately 5–8 % of women in the United States seek medical care for a yeast infection each year. Global estimates suggest a similar pattern, with higher rates in regions where diabetes and HIV are more prevalent.

Sources: CDC, Mayo Clinic, WHO.

Symptoms

Symptoms usually develop within 24‑72 hours after the fungal over‑growth begins. Not all women experience every sign.

• Itching or burning sensation – most common and can be intense, especially around the vulva.
• Vaginal discharge – thick, white, “cottage‑cheese” appearance; typically odorless.
• Redness and swelling of the vulva, labia, and vaginal opening.
• Soreness during intercourse (dyspareunia) or while urinating.
• Rash or skin irritation around the perineal area.
• Feeling of a foreign body in the vagina.

Rarely, an infected woman may notice a mild, sour odor, but a strong foul smell usually points to bacterial vaginosis rather than candidiasis.

Causes and Risk Factors

Primary cause

The main cause is an uncontrolled proliferation of Candida species, especially C. albicans. The fungus thrives in warm, moist environments and can multiply when the vaginal pH becomes less acidic (pH > 4.5).

Key risk factors

• Antibiotic use – broad‑spectrum antibiotics (e.g., amoxicillin, tetracycline) reduce the protective lactobacilli that keep Candida in check.
• Hormonal changes – pregnancy, oral contraceptives, hormone replacement therapy, and menstrual cycle fluctuations raise estrogen levels, which increase glycogen in vaginal cells, providing food for the fungus.
• Diabetes – especially uncontrolled blood glucose; urine and vaginal secretions become richer in sugars.
• Impaired immunity – HIV/AIDS, chemotherapy, corticosteroids, or other immunosuppressive conditions.
• High‑sugar or high‑carbohydrate diet – may raise blood glucose, favoring fungal growth.
• Tight, non‑breathable clothing – synthetic underwear, wet swimwear, or prolonged use of panty liners create a moist environment.
• Douching or scented hygiene products – disturb normal vaginal flora.
• Sexual activity – while not classified as a sexually transmitted infection, friction or transfer of yeast from a partner can trigger an episode.

Diagnosis

Most cases are diagnosed clinically based on symptoms, but laboratory confirmation is recommended when:

• Symptoms are atypical or recurrent.
• First episode occurs after age 50 (to exclude malignancy).
• Patient is immunocompromised or pregnant.

Diagnostic methods

1. Physical examination – visual inspection of the vulva and speculum examination of the vagina.
2. Microscopic analysis (wet mount) – a saline preparation of vaginal discharge examined under a microscope for budding yeast and pseudohyphae.
3. Candida culture – swab sent to a lab; takes 48‑72 hours, useful for recurrent infections or when resistant species are suspected.
4. pH testing – vaginal pH > 4.5 suggests bacterial vaginosis or trichomoniasis rather than candidiasis (typically pH ≈ 4.0).
5. Molecular testing (PCR) – increasingly available; detects Candida DNA and can identify non‑albicans species.

Self‑diagnosis using over‑the‑counter kits is possible, but a health‑care professional should confirm the diagnosis if symptoms are severe, atypical, or recurrent.

Sources: Cleveland Clinic, NIH, WHO.

Treatment Options

Therapy aims to eradicate the fungus, relieve symptoms, and prevent recurrence.

First‑line medications

• Azole antifungals (topical) – clotrimazole 1 % or miconazole 2 % cream/ovule applied intravaginally for 3–7 days. Over‑the‑counter (OTC) products are effective for uncomplicated cases.
• Azole antifungals (oral) – fluconazole 150 mg single dose (most common) or a 3‑day regimen (150 mg every 72 hours). Oral therapy is convenient for women who have difficulty applying creams.

Recurrent vulvovaginal candidiasis (RVVC)

Defined as ≥4 episodes in 12 months.

• Induction phase: oral fluconazole 150 mg every 72 hours for three doses.
• Maintenance phase: oral fluconazole 150 mg once weekly for 6 months (or up to 12 months).
• Alternative regimen: topical boric acid capsules (600 mg vaginally at night for 14 days), especially for non‑albicans species resistant to azoles.

Special circumstances

• Pregnancy – topical azoles (clotrimazole, miconazole) are preferred; a single dose of oral fluconazole is generally avoided after the first trimester.
• Diabetes – optimize glycemic control alongside antifungal therapy.
• Immunocompromised patients – may need longer courses or higher‑dose fluconazole; monitor for systemic candidiasis.

Lifestyle & adjunct measures

• Wear cotton underwear and loose‑fitting clothing.
• Avoid scented soaps, douches, and bubble baths.
• Change out of wet clothing (swimwear, gym clothes) promptly.
• Maintain good glycemic control if diabetic.
• Consider probiotic supplements containing Lactobacillus rhamnosus or L. reuteri to restore vaginal flora (evidence modest but low‑risk).

Living with Vaginal Candidiasis

Day‑to‑day management

• Symptom relief – cool sitz baths, plain yogurt applied externally (if no latex allergy), or topical antihistamines can soothe itching.
• Medication adherence – complete the full course even if symptoms resolve early; stopping early can lead to recurrence.
• Sexual activity – use condoms during treatment; avoid intercourse if the partner experiences genital itching until both are treated.
• Track episodes – keep a simple diary (date, precipitating factors, treatment) to discuss with your clinician if infections become frequent.
• Psychological impact – recurrent infections can cause anxiety or embarrassment. Seek support from a healthcare provider or counselor if distress interferes with daily life.

When to follow‑up

If symptoms persist beyond 7 days after completing therapy, or if they recur within a month, schedule a follow‑up visit for repeat testing and possible culture to identify resistant species.

Prevention

While not all episodes are preventable, the following strategies reduce risk:

• Limit unnecessary antibiotic use; ask your doctor about a probiotic when antibiotics are prescribed.
• Keep the vaginal area dry – gently pat (don’t rub) after bathing, and change tampons/pads frequently.
• Choose breathable undergarments; avoid tight, synthetic fabrics.
• Control blood sugar levels if you have diabetes.
• Consider a maintenance dose of fluconazole (once weekly) if you have documented RVVC.
• Avoid douching and scented feminine hygiene products.
• Practice good hand hygiene, especially after using the bathroom.

Complications

If left untreated or if infections become severe, complications may arise:

• Persistent discomfort – chronic itching and irritation can lead to skin breakdown.
• Secondary bacterial infection – damaged skin can be colonized by bacteria, requiring antibiotics.
• Recurrent vaginal infections – can affect sexual health and quality of life.
• Systemic candidiasis – extremely rare in immunocompetent women, but immunosuppressed patients can develop bloodstream infection.
• Complications during pregnancy – severe or untreated candidiasis may increase the risk of preterm labor, though evidence is limited.

When to Seek Emergency Care

Sources: Mayo Clinic, CDC, NIH, WHO, Cleveland Clinic, JAMA Dermatology (2022 review of recurrent vulvovaginal candidiasis).

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