Toenail fungus, or onychomycosis, affects 10-12% of the population. While not dangerous, it is cosmetically bothersome and can be difficult to eliminate.
How It Starts
Fungal spores enter under the nail through tiny cracks. Warm, moist environments—like sweaty shoes or swimming pools—promote fungal growth. Once established under the nail, the fungus spreads gradually toward the nail base.
Infected nails become thick, discolored (usually brown or white), and brittle. As infection progresses, the nail may separate from the nail bed. Multiple nails can be affected.
Risk Factors
Previous nail injury increases infection risk. Diabetes impairs immune function, increasing susceptibility. Older age is a risk factor. Walking barefoot in moist areas (pools, locker rooms, communal showers) exposes you to fungal spores.
Treatment Options
Topical antifungal creams have limited effectiveness because they don't penetrate thick nails well. Nail lacquers (amorolfine or ciclopirox) work slowly—usually 6-12 months to clear infection.
Oral antifungal medications (terbinafine or itraconazole) are more effective, working against fungi from within. Terbinafine is typically prescribed for 12 weeks. Success rates are 60-80%, though recurrence is possible.
Laser and Nail Removal
Laser treatments show promise but require multiple sessions and cost significantly. Results are variable. Surgical nail removal followed by topical antifungal application is an option for resistant infections.
Recurrence Prevention
Infection recurs if reexposure occurs. Keep toenails trimmed short. Wear breathable shoes that dry quickly. Avoid walking barefoot in communal areas. Change socks if they become damp.
Treat any current athlete's foot or other fungal infections—these are common routes to nail infection. Maintain good toenail hygiene; get professional pedicures only at reputable establishments with proper sterilization.
Timeline Expectations
Even with treatment, months pass before infected nail grows out. The healthy nail growing from the base gradually replaces the infected portion. Complete resolution takes 6-12 months after treatment begins.
When to Treat
Consider treating if infected nails bother you or you have diabetes (infection risk). Some people accept nail discoloration if asymptomatic.