Preventing yeast infections comes down to maintaining the conditions that keep Candida, the fungus naturally present in your vagina, from overgrowing. A healthy vaginal environment has a pH below 4.5, maintained by beneficial bacteria called lactobacilli that produce lactic acid and other antifungal compounds. When that balance gets disrupted, Candida shifts from a harmless yeast form into an invasive form that causes the itching, burning, and discharge you want to avoid.
Most prevention strategies work by protecting or restoring that bacterial balance. Here’s what actually helps.
How Your Body Prevents Overgrowth Naturally
Lactobacilli are the workhorses of vaginal defense. They compete with Candida for space on the vaginal lining, produce lactic acid that keeps pH acidic, and release hydrogen peroxide and other compounds that directly inhibit fungal growth. When lactobacilli are thriving, the low pH environment also prevents Candida from morphing into its more aggressive, infection-causing form. Anything that depletes these bacteria or raises vaginal pH opens the door to a yeast infection.
Skip the Douching and Scented Products
Douching is one of the most reliable ways to set yourself up for an infection. It strips away lactobacilli, raises vaginal pH, and weakens your body’s natural defenses. Some douching products contain antimicrobial agents that are directly toxic to the beneficial bacteria you need. Shower gel, liquid soap, and scented washes aren’t formulated for vaginal use either. They can cause irritation, inflammation, and increased susceptibility to infections.
The vagina is self-cleaning. Warm water on the external area is sufficient. Scented tampons, pads, and sprays can also introduce chemicals that disrupt your flora.
Wear Breathable Fabrics
Yeast thrives in warm, moist environments, so the fabric sitting against your skin matters. Cotton is the best choice for everyday underwear because it wicks away sweat and moisture that feed fungal growth. Synthetic fabrics trap heat and humidity, and even underwear with a cotton crotch panel doesn’t offer the same breathability as 100% cotton.
If you’re prone to recurrent infections, opt for looser-fitting clothing and skip the panty liners when you don’t need them, since they reduce airflow. Change your underwear if it becomes damp during the day. Going without underwear at night, or wearing loose pajama shorts, increases ventilation and can help prevent or heal irritation.
Manage Blood Sugar and Diet
Candida feeds on glucose. Research shows a direct relationship between glucose concentration and Candida growth rates, which is a major reason yeast infections are so common in people with poorly controlled diabetes. When blood sugar stays elevated, glucose levels rise in vaginal secretions too, creating a nutrient-rich environment for the fungus.
You don’t need to have diabetes for this to matter. Consistently high sugar intake raises blood glucose and can tip the balance toward overgrowth. Keeping blood sugar relatively stable through balanced meals, limiting refined sugars, and staying physically active reduces the fuel available to Candida.
Understand the Estrogen Connection
Elevated estrogen is one of the strongest risk factors for yeast infections. Estrogen promotes glycogen production in vaginal tissue, which provides extra nutrients for Candida to expand. It also helps the fungus evade your immune system by interfering with a key process your white blood cells use to identify and destroy it.
This is why yeast infections are more common during pregnancy, while taking high-estrogen oral contraceptives, and during hormone replacement therapy. Postmenopausal women, whose estrogen levels drop, get yeast infections less frequently. If you’re on hormonal birth control and dealing with recurring infections, talking to your prescriber about a lower-estrogen option could make a difference.
Protect Yourself During Antibiotic Use
Antibiotics kill bacteria indiscriminately, including the lactobacilli that keep Candida in check. This is one of the most common triggers for yeast infections. Probiotics containing Lactobacillus strains are widely recommended during and after antibiotic courses to help replenish beneficial bacteria and prevent yeast from taking over.
A randomized, placebo-controlled trial of 64 women found that daily oral capsules containing Lactobacillus rhamnosus GR-1 and Lactobacillus fermentum RC-14 significantly increased vaginal lactobacilli and reduced yeast colonization within 28 days. These two strains are among the most studied for vaginal health and are available in over-the-counter probiotic supplements. Look for products that specifically list these strains and take them throughout your antibiotic course and for at least a few weeks afterward.
Be Careful Around Sexual Activity
Yeast infections aren’t classified as sexually transmitted infections, but sexual activity can play a role. Intercourse can introduce new microorganisms, cause micro-abrasions that make tissue more vulnerable, and spread an existing infection between partners. If either you or your partner has symptoms, it’s best to pause sexual contact until treatment is complete and to make sure both of you are treated if needed.
Lubricants with glycerin or added sugars can also feed yeast. Choose water-based, glycerin-free options if you’re prone to infections.
When Infections Keep Coming Back
Recurrent vulvovaginal candidiasis, defined as three or more symptomatic episodes in a single year, affects fewer than 5% of women. If you’re in that group, over-the-counter prevention strategies alone may not be enough.
The standard medical approach for recurrent infections is a weekly oral antifungal taken for six months as maintenance therapy. For people who can’t take oral medication or prefer an alternative, intravaginal boric acid suppositories at 300 to 600 milligrams used two to three times per week have shown promise as a maintenance option, typically after an initial treatment course clears the active infection.
Recurrence often has overlapping causes: hormonal shifts, antibiotic exposure, blood sugar issues, or a partner reintroducing the fungus. Addressing as many contributing factors as possible gives you the best chance of breaking the cycle. Keeping a simple log of when infections occur alongside your menstrual cycle, diet changes, medications, or sexual activity can help you and your healthcare provider identify your specific triggers.