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1. Respiratory Health Issues. Downward curved fingernails can indicate a problem with respiratory health, and are often present in people who have medical conditions such as COPD, chronic bronchitis, asthma and lung cancer. Fingernails often curve downwards as a result of lack of oxygen.
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.