Gray nails, also called onychomycosis, are usually caused by fungal infections of the nails of the hands or feet, and are contagious to a certain extent. A large number of disease-causing fungi gather in the nail plate and nail bed, and there are a large number of disease-causing fungi in the gray nail clippings that fall off anywhere and anytime. The close daily contact between husband and wife can be transmitted through direct or indirect contact. If the other spouse has poor body resistance or broken fingernails, the possibility of contagion will be higher. If one of the husband and wife suffers from gray nails, they should pay attention to not share hygiene products with their family members, such as towels, bath towels, foot mats, slippers, nail clippers, as well as foot bathtubs, bathtubs, etc., which need to be used exclusively by one person for separate cleaning. At the same time, patients need to pay attention to personal hygiene habits, for the use of high degree of supplies, need to be regularly cleaned and disinfected, gloves, shoes and socks should often be in the sun to dry. In addition, the patient still need to actively seek medical treatment, follow the doctor’s advice oral terbinafine, itraconazole for antifungal treatment, can also choose terbinafine ointment, sertaconazole ointment and other external treatment. If necessary, nail debridement or adjunctive treatments such as laser and photodynamic therapy are required.