The hazards of gray nails or onychomycosis in women mainly include its contagiousness, damage to nails and impairment of hand function. 1. contagious: ringworm of the nail is mainly caused by fungal infections such as red trichophyton and trichophyton fungus, which can be spread through contact. Including self-transmission and transmission to others. 2. Damage to the nail: the affected nail may show symptoms such as turbidity, thickening, loss of luster, unevenness, and shedding, which affects the appearance of the nail. Meanwhile, the course of onychomycosis is long and can be repeated, and in serious cases, it can lead to permanent nail damage. 3. Impairment of function: Severe onychomycosis can affect the fine function of the hands or feet. If there is any discomfort, it is recommended to consult a doctor in time and follow the doctor’s instructions.