Preventing fungal infections comes down to controlling moisture, keeping skin clean and dry, and reducing your exposure to fungal spores in the environment. Out of the millions of fungal species that exist, only a few hundred can make people sick, but the ones that do are remarkably common. Ringworm, nail infections, athlete’s foot, and yeast infections affect millions of people every year, and most are preventable with straightforward daily habits.
Keep Skin Clean and Dry
Fungi thrive in warm, moist environments, which is why infections so often show up between toes, in skin folds, and in the groin area. The single most effective thing you can do is dry these areas thoroughly after bathing or sweating. Pay attention to the spaces between your toes, under your breasts, and anywhere skin touches skin. A clean, dry towel used once (not shared) is your first line of defense.
If you exercise or sweat heavily during the day, change out of damp clothes as soon as possible. Sitting in a wet swimsuit or sweaty workout gear creates exactly the conditions fungi need to colonize skin. Showering promptly after the gym, wearing flip-flops in shared locker rooms and pool decks, and drying off completely before getting dressed all reduce your risk significantly.
Choose the Right Fabrics
Your clothing choices matter more than you might think. Research from Cornell University found that fiber structure is the most important factor in how well fabric retains and releases fungal spores. Cotton, with its irregular fiber surface, harbored and dispersed spores of common fungi far more than smoother synthetic fibers like polyester or rayon. That makes moisture-wicking synthetic fabrics a better choice for workout clothes and socks, since they pull sweat away from the skin and have smoother fibers that hold onto fewer spores.
For everyday wear, breathable fabrics and loose-fitting clothes help air circulate around your skin. Tight shoes, especially those made of non-breathable materials, trap heat and moisture around your feet. If you’re prone to athlete’s foot or toenail fungus, rotating your shoes so each pair has a full day to dry out between wears can make a real difference.
Wash Clothes and Linens at the Right Temperature
Standard cold-water washing doesn’t reliably kill fungal spores. Research on laundry contamination found that the dermatophyte fungus responsible for athlete’s foot and ringworm can survive washing at 86°F (30°C) but is eliminated at 140°F (60°C). Standard bleach alone doesn’t kill common fungal spores in cold water either, but combining bleach with water temperatures above 86°F (30°C) dramatically improves its effectiveness.
If you’re dealing with a recurring fungal infection, wash your socks, underwear, towels, and bed linens on a hot cycle. Dry them completely in a dryer rather than air-drying, since residual moisture can allow spores to survive. Don’t share towels, washcloths, or bedding with someone who has an active infection.
Control Humidity in Your Home
Indoor mold and fungal growth become likely once relative humidity climbs above 60%. The EPA recommends keeping indoor humidity between 30% and 50% for the best protection. A simple hygrometer (available for under $15 at most hardware stores) lets you monitor this.
Practical steps include running exhaust fans in bathrooms and kitchens, fixing leaks promptly, and using a dehumidifier in damp basements or crawl spaces. If you use a humidifier during winter, set it below 60% relative humidity. Condensation on windows is a visible warning sign that your indoor humidity is too high. Wipe it up and improve ventilation before mold takes hold.
Protect Yourself Outdoors and at Work
Several fungal infections come from spores in soil, not from other people. Valley fever is caused by a fungus in soil across the southwestern U.S. Histoplasmosis lives in soil contaminated with bird or bat droppings, particularly in the Ohio and Mississippi River valleys. Blastomycosis comes from disturbed soil near lakes, rivers, and wooded areas.
If you work in construction, landscaping, demolition, or any job that disturbs soil, CDC workplace guidelines recommend specific precautions: wet down soil and debris before digging to suppress dust, use equipment with enclosed and HEPA-filtered cabs when possible, and stay upwind of digging. During dust storms or high winds, stop outdoor work entirely. A fit-tested N95 respirator provides protection against inhaled fungal spores during high-risk activities. Even recreational activities like spelunking, cleaning chicken coops, or renovating old buildings can expose you to concentrated fungal spores.
Preventing Vaginal Yeast Infections
Yeast infections happen when naturally occurring Candida yeast in the vagina overgrows, usually triggered by antibiotics, hormonal changes, high blood sugar, or a disrupted vaginal microbiome. Wearing breathable cotton underwear, avoiding scented soaps and douches in the genital area, and changing out of wet clothing quickly all help maintain the acidic environment that keeps yeast in check.
Probiotics show genuine promise for prevention. A meta-analysis published in the American Journal of Obstetrics and Gynecology found that probiotics alone improved the six-month cure rate for recurrent yeast infections roughly 12-fold compared to placebo. The benefit appeared across different strains, doses, and delivery methods (oral or vaginal), though researchers note the evidence is still developing. If you get frequent yeast infections, adding a probiotic supplement is a low-risk strategy worth trying alongside other preventive habits.
Strengthen Your Body’s Defenses
Your immune system is the reason most people breathe in fungal spores daily without getting sick. Serious fungal infections like cryptococcosis, aspergillosis, and pneumocystis pneumonia almost exclusively affect people with weakened immune systems, whether from HIV, organ transplants, chemotherapy, or long-term steroid use. For these individuals, prevention involves both environmental precautions and sometimes preventive antifungal medication prescribed by a specialist.
For everyone else, the basics of immune health apply: adequate sleep, a balanced diet, managing blood sugar (high glucose feeds fungal growth), and avoiding unnecessary antibiotic use. Antibiotics wipe out the bacteria that normally compete with fungi on your skin and in your gut, which is why yeast infections so often follow a course of antibiotics. When you do need antibiotics, taking the full prescribed course (no more, no less) helps minimize this disruption.
Daily Habits That Add Up
Most fungal infections aren’t caused by a single exposure but by repeated conditions that favor fungal growth. A few consistent habits cover the vast majority of risk:
- Dry thoroughly after every shower, especially between toes and in skin folds
- Change damp clothes promptly after exercise or swimming
- Wash gym clothes and towels on hot cycles (140°F / 60°C)
- Wear breathable shoes and socks, and rotate pairs to allow drying
- Keep indoor humidity between 30% and 50%
- Use flip-flops in shared showers, locker rooms, and pool areas
- Suppress dust when disturbing soil, especially in endemic areas
- Avoid sharing towels, nail clippers, and shoes
None of these steps are complicated on their own. The challenge is consistency, since fungi are patient organisms that exploit brief windows of warmth and moisture. Building these habits into your routine is the most reliable way to keep fungal infections from taking hold.