What causes fingernails to split horizontally down the middle?
1. Introduction Fingernails splitting horizontally down the middle is a clinical sign indicating structural damage to the nail plate, most commonly caused by repeated cycles of wetting and drying, physical trauma, or nutritional deficiencies. This condition is medically known as onychoschizia. When the intracellular adhesion within the nail matrix is compromised, the layers of keratin … Read more