Slide show: 7 fingernail problems not to ignore

Spoon nails (koilonychia) are soft nails that look scooped out. The depression usually is large enough to hold a drop of liquid.

Often, spoon nails are a sign of iron deficiency anemia or a liver condition known as hemochromatosis, in which your body absorbs too much iron from the food you eat. Spoon nails can also be associated with heart disease and hypothyroidism.