Empty toenails may be related to toenail trauma, or may be caused by nail malnutrition, gray nails, onychomycosis and other reasons. 1. Toenail trauma: when the toenail is smashed by external forces, it is easy to cause the toenail to bruise phenomenon, resulting in the separation of the nail flesh, thus causing the toenail empty. 2. Nail malnutrition: usually caused by trauma, frostbite and other physical injuries, but also due to long-term excessive exposure to irritating detergents, acidic solutions and other factors. In addition, skin diseases such as lichen planus and psoriasis may cause damage to the nail matrix, resulting in nail dystrophy, which is manifested as empty toenails. 3. gray nails: usually caused by fungal infection of the toenail, due to fungal infection, leading to the destruction of the nail bed, resulting in empty toenails, which may also be accompanied by thickening of the nail thickness, decreased gloss and other manifestations. 4. ringworm of the nail: mainly due to the toenail by purple trichophyton or Sudan trichophyton and other pathogenic bacteria infection caused by the pathogenic bacteria usually invade the deck, resulting in the destruction of the nail plate, resulting in empty toenails, may also be accompanied by the deck discoloration, thickening and other manifestations. Empty toenails may also be caused by other reasons, if accompanied by obvious discomfort, it is recommended to consult a doctor as soon as possible, after diagnosis of the causative factors, to give targeted treatment.