Empty fingernails may be caused by trauma, lack of trace elements, fungal infections and other factors. 1. Trauma: If the fingernail is overly squeezed or smashed by heavy objects, it will easily lead to atrophy of the muscle tissue under the nail bed, causing bruising between the nail and the nail plate, resulting in separation of the nail and the muscle tissue, and the fingernail is empty. 2. Lack of micronutrients: If the long-term excessive partiality, picky eating and other bad habits, it will easily lead to a lack of fiber and vitamins in the body, resulting in the phenomenon of empty fingernails. 3. Fungal infection: when the patient’s fingernails appear fungal infection, it may lead to onychomycosis, also known as gray nails, which will make the nails become empty, and there is a white powder inside the nails, and in serious cases, it will cause the nails to fall off. The patient appeared fingernail hair empty, should go to the hospital in time, clear cause of disease strictly follow the doctor’s instructions for standardized treatment.