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But in general, if your fingernails are strong, but curling this is less of a concern than if they are weak and âbendyâ. Specifically: Curling down is very much associated with respiratory problems- asthma, chronic bronchitis, emphysema and the like. Iron deficiency will produce pale nails which can curl.
Koilonychia is more commonly referred to as spoon nails, and it occurs mostly in the fingernails. It is the abnormal development of nails, often resulting in a depressed or concave formation. This condition shows itself in concaved and thinned nails with raised edges, a shape that is almost the same as that of a spoon.