Empty fingernails may be associated with nail dystrophy, nail trauma, onychomycosis, perinail warts, and so on. 1. Nail dystrophy: Nail dystrophy is related to congenital factors, skin diseases and exposure to chemical substances. Usually, the patient’s nails will change in character, texture and color, which can be manifested as transverse nail groove, longitudinal nail groove, split in the middle of the nail plate, nail peeling, spoon-shaped nail, etc., and some patients may have fingernails become empty phenomenon. 2. Nail trauma: some patients may suffer from trauma to the fingernail area, resulting in separation of the nail bed and the phenomenon of empty fingernails. 3. Ringworm of the nail: ringworm of the nail is related to the infection of skin fungus. Usually, the nail plate of patients with onychomycosis can be manifested as turbid, thickening, discoloration, atrophy, shedding, warping, etc., and also due to the separation of the nail plate and the phenomenon of empty fingernails. 4. periungual warts: periungual warts are related to human papillomavirus infection, some patients may appear fingernail empty phenomenon, but also can be manifested as nail deformation, nail missing, nail surface roughness. It is recommended that the person who has the fingernail become empty should go to the doctor for examination, after clearing the cause of the disease, follow the doctor’s instructions to treat, and promote the fingernail to return to normal.