Nails from top to bottom white to consider and nail papilloma, nail fungal disease, nail psoriasis and other factors. 1. Nail papilloma: this disease is clinically rare benign tumors appearing in the nail bed area, the patient is mostly manifested as the distal end of the nail can appear wedge-shaped groove, which has white, brown-like keratin attachment or nail bed longitudinal growths. 2. Nail fungal disease: for patients with fungal infection of nail fungus, there are nail whitening, nail thickening and other manifestations, and in severe cases, there is nail loss. 3. Nail psoriasis: this disease belongs to a special type of psoriasis, and the patients will mostly show that the nail surface is uneven, the nail plate loses its luster and turns white, and in serious cases, the nails will be peeled off. For patients whose nails turn white from top to bottom, it is recommended that they go to regular hospitals for consultation and active treatment under the guidance of doctors after the cause of the disease is clarified.