Gray nail is a fungal infection of the nails, not a precursor of cancer. Some people with onychomycosis or tinea pedis may develop gray nails, which are mainly characterized by nail growth and thickening, and later nail deformation and brittleness, and may be combined with toe deformation in elderly patients. Pathologically, gray nails are fungal infections that destroy the nail bed, causing abnormal growth and nutrition of the nails, and can occur in one or more nails at the same time. Gray nails do not correlate with common cancers, nor with tumors, and do not suggest that the presence of gray nails predisposes one to cancer, or that the presence of cancer is followed by the presence of gray nails. Gray nails need to take antifungal treatment, you can use topical antifungal drugs. At the same time, severe gray nails need to take oral antifungal drugs, but antifungal drugs have strong side effects, so pay attention to the choice of antifungal drugs and the use of dosage, and at the same time appropriate discontinuation of medication for review. In the end, as long as the correct, scientific treatment of gray nails, patients can appear to improve or even cured.