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Vaginal Yeast Infection Causes – Key Risk Factors

Vaginal yeast infections are most commonly caused by an overgrowth of the fungus Candida albicans. Learn about the key causes and risk factors involved.

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Vaginal yeast infections are most commonly caused by an overgrowth of the fungus Candida albicans. Learn about the key causes and risk factors involved.

What is a Vaginal Yeast Infection?

A vaginal yeast infection, medically known as vaginal candidiasis or vulvovaginal candidiasis (VVC), is a fungal infection of the vagina and the external female genitalia. It is most commonly caused by the yeast Candida albicans. Candida fungi are naturally present on mucous membranes throughout the body and typically exist in balance with other microorganisms. When this balance is disrupted, the fungus can multiply excessively and cause an infection.

Causes of Vaginal Yeast Infections

A vaginal yeast infection is not usually acquired from an external source. Instead, it results from a disruption of the natural balance of the vaginal flora. Multiple internal and external factors can disturb this balance.

Changes in the Vaginal Flora

A healthy vagina contains Lactobacillus bacteria that produce lactic acid, maintaining an acidic pH. This acidic environment inhibits the growth of fungi and harmful bacteria. When the pH rises or the number of Lactobacilli decreases, Candida can multiply unchecked.

Antibiotic Use

One of the most common causes of vaginal yeast infections is the use of antibiotics. Antibiotics eliminate not only harmful bacteria but also the beneficial Lactobacilli in the vagina. This disrupts the vaginal flora and allows Candida to overgrow.

Hormonal Changes

Hormonal fluctuations play a significant role in the development of vaginal yeast infections. Risk is increased during the following phases:

Pregnancy: Elevated estrogen levels alter vaginal tissue and promote fungal growth.
Menstrual cycle: Hormonal shifts, particularly in the second half of the cycle, can influence vaginal flora.
Menopause: Declining estrogen levels change the mucosal lining, making it more susceptible to infections.
Hormonal contraceptives: Birth control pills or other hormonal methods can affect the hormonal balance.

Diabetes Mellitus

People with poorly controlled diabetes mellitus have a significantly higher risk of vaginal yeast infections. Elevated blood sugar levels provide a nutrient source for Candida. Increased sugar content in vaginal secretions further promotes fungal growth.

Weakened Immune System

A weakened immune system is a major risk factor for vaginal yeast infections. Conditions that compromise immunity include:

HIV infection or AIDS
Use of immunosuppressive medications (e.g., after organ transplantation)
Chemotherapy or radiation therapy
Chronic illnesses such as autoimmune diseases
General physical stress and chronic fatigue

Intimate Hygiene and Clothing

Certain hygiene habits and clothing choices can also increase the risk:

Excessive washing or douching of the vagina: Destroys the natural protective flora.
Tight, synthetic underwear: Promotes moisture and warmth, which encourages fungal growth.
Wet swimwear or sportswear: Prolonged wearing of damp clothing creates a fungi-friendly environment.
Harsh intimate hygiene products: Scented soaps, shower gels, or sprays can irritate the mucous membranes and alter pH levels.

Diet

A high-sugar diet can promote the growth of Candida fungi, as sugar serves as an energy source for the fungus. Increased consumption of refined carbohydrates and sugars is considered a contributing factor, particularly in recurrent infections.

Stress and Sleep Deprivation

Chronic stress and lack of sleep weaken the immune system and can indirectly increase the risk of vaginal yeast infections. Stress triggers the release of cortisol, which has immunosuppressive effects and can negatively impact the balance of vaginal flora.

Sexual Activity

A vaginal yeast infection is not a classic sexually transmitted infection; however, sexual intercourse can alter the vaginal pH and mechanically irritate the mucous membrane, potentially disrupting vaginal flora. In rare cases, transmission between partners can occur.

When to See a Doctor

If symptoms such as itching, burning, abnormal discharge, or pain occur for the first time, medical advice should always be sought to rule out other conditions. Recurrent infections (more than four times per year) also warrant medical evaluation to identify possible underlying conditions such as diabetes.

References

Centers for Disease Control and Prevention (CDC): Vaginal Candidiasis. Available at: https://www.cdc.gov/fungal/diseases/candidiasis/genital
Sobel, J.D.: Vulvovaginal candidosis. The Lancet, 2007; 369(9577): 1961–1971.
Workowski, K.A. et al.: Sexually Transmitted Infections Treatment Guidelines. MMWR Recomm Rep, 2021; 70(4): 1–187.

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