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 condition that can be an indicator of hypochromic anemia, particularly iron-deficiency anemia. It refers to abnormally thin nails (usually on the fingers) which have lost their convexity, becoming flat or even concave in shape.