Other nail conditions besides onycholysis include conditions like Beau's lines, brittle nails, koilonychia, leukonychia, and pitting. Beau's lines are indents in the nail because of malnutrition. Brittle nails come with aging and result in frequent breaks. Koilonychia produces thin, curved nails due to an iron deficiency. Nails with leukonychia have pale, white marks all over the nail. Pitting in the nail involves small divots and crumbling on the nail surface.