Often hear some people say that patients with gray nails have no way to cure, the TV program inside the advertisement: have gray nails, one infected two. In the end, what is gray nails? What are the dangers of gray nails? How to prevent gray nails? Gray fingernails, in medicine is called nail fungal disease, is a fungus caused by toenail infection. Clinical generally through the fungal microscopy to diagnose gray nails. First, “gray nails” what are the hazards: 1, cause disease: (1) inguinitis: gray nails can cause stubborn chronic inguinitis (2) skin infection: gray nails can cause the destruction of the barrier function of the surrounding skin, which leads to secondary infection of the skin and soft tissue. (3) Contagious: Self-infection, can cause ringworm, ringworm, etc., women may also cause vulvovaginal candidiasis. Contagious to others, the patient’s hands or feet touched the goods, others again contact, may be infected with fungi, the patient’s parents, children are most likely to be infected, now even some babies also got gray nails. (4) Metabolic diseases: fungal infection of gray nails can cause chronic eczema, urticaria and other allergic diseases. 2, affect the beauty of the daily life, the highest frequency of exposure belongs to the face and hands, hands are the second face of mankind, our country to the handshake ceremony is based on, if you suffer from gray nails, it is bound to be embarrassed. 3, affect life, such as cooking, knitting, playing; walking, running, etc., watching children, scratching, etc.. 4, affect the work of doctors, nurses; food industry, chefs, bakers; silk workshop workers, public relations. 5, psychological disorders, especially long-term treatment is ineffective sense of embarrassment; frustration; embarrassment; low self-esteem II, how to prevent and control gray nails? (1) Pay attention to personal hygiene. (1) Pay attention to personal hygiene, such as not wearing other people’s slippers, not using other people’s towels, not sharing the foot basin, etc.; (2) Avoid prolonged contact with water or chemicals; (3) Avoid direct contact with patients with gray fingernails; (4) Avoid trauma or impact, including high-heeled shoes, (5) Avoid wearing impermeable shoes; (6) Pay attention to their own nutritional status, and strengthen the exercise; (7) Actively treating the primary disease such as tinea versicolor and other fungal infections. Third, how to treat: 1, the first prerequisite is the correct diagnosis! Half of the nail disease for non-nail fungal disease, many non-nail fungal disease can have can nail fungal disease similar clinical manifestations, so must do fungal microscopy, if necessary to do fungal culture sometimes may need to be repeated several times culture. 2, standardized treatment: (1) local treatment: 5% amorolfine rub, 8% cyclopiazepam methyl rub; (2) systemic treatment: terbinafine, itraconazole, ashwagandha, ketoconazole. Before systemic treatment, take the medicine for one month, and check the liver function in three months; (3) Physical therapy: laser therapy, etc.; (4) Surgical treatment: nail extraction, etc..