What causes onychomycosis (gray nail)? What are the reasons for gray nail?

The main causes of nail fungus (onychomycosis) include: 1. Fungal infection: Nail fungus is primarily caused by fungal infections, such as dermatophytes. These fungi thrive in warm, moist, and poorly ventilated environments, making it easier for them to infect the nails. 2. Personal habits: Wearing non-breathable shoes and socks for prolonged periods, or frequently using shared slippers or swimming pools, can create favorable conditions for fungal growth and increase the risk of infection. 3. Nail beauty practices: Frequent manicures and nail treatments may damage the natural protective layer of the nails, making them more vulnerable to fungal invasion. 4. Weakened immune system: Individuals with low immunity, especially the elderly and those with diabetes, are more susceptible to fungal infections and thus at higher risk of developing nail fungus. 5. Trauma and underlying diseases: Nail injuries or certain medical conditions can reduce skin sensitivity and resistance, increasing the likelihood of developing nail fungus. Nail fungus results from a combination of multiple factors. Preventing it requires attention to all the above aspects.