White nails can be caused by onychomycosis, onychomycosis, trauma, anemia and other factors. 1. Ringworm of the nail: after the nail has been infected by fungus, the fungus can invade the cuticle of the nail, resulting in whitening, brittleness, thickening and other manifestations of the nail. 2. Nail whitening disease: Nail whitening disease can be manifested as whitening in the middle of the nail, which belongs to a type of nail dystrophy, and may be caused by the lack of certain micronutrients. 3. Trauma: Nail trauma, due to the nail bed nail plate and other injuries, can also lead to the appearance of the middle of the nail white performance. 4. Anemia: When systemic diseases such as anemia occur, whitening of the nails can also occur at the end of the nail. When the nails in the middle of the white should be timely medical treatment, under the guidance of specialists and actively carry out standardized treatment, to help early relief of the discomfort symptoms.