Which nail condition is characterized by thin, spoon-shaped nails?

Koilonychia, often referred to as "spoon nails," is a condition where the nails appear thin and have a concave or spoon-like shape. This nail condition can be indicative of underlying health issues, such as iron deficiency anemia or other systemic conditions. The characteristic structure of the nails in koilonychia arises from a change in the nail's growth pattern, which affects how the keratin is formed and distributed in the nail plate. The presence of a spoon shape can lead to further complications, as these nails may be more brittle and susceptible to damage. Understanding koilonychia's features is essential for nail technicians, as it can signal to them that a client may need to be referred to a healthcare provider for further evaluation.