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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, the medical term given to weak nails that curl upward, have a unique presentation. According to the Mayo Clinic, the nail bed itself is concave, and in more extreme cases is scooped out enough to hold a small drop of liquid. The nail itself is thin and fragile.ron Deficiency. Iron is a part of hemoglobin, the protein in your blood that transports oxygen throughout your body. Anemia, of which there is more than one type, results when your body doesn't manufacture enough red blood cells to get oxygen to your body tissues.