Koilonychia, also known as spoon nails, is a nail disease that can be a sign of hypochromic anemia, especially  iron-deficiency anemia. It refers to abnormally thin nails (usually of the hand) which have lost their convexity, becoming flat or even concave in shape.
Koilonychia, also known as spoon nails, is a nail disorder that can be associated with hypochromic anemia, particularly iron-deficiency anemia. It describes nails that are abnormally thin and flattened, often found on the hands, losing their typical convexity.