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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.
Causes of Abnormally curved ends of fingernails: The following medical conditions are some of the possible causes of Abnormally curved ends of fingernails. There are likely to be other possible causes, so ask your doctor about your symptoms. Abnormally curved ends of fingernails and Abnormally curved ends of toenails (7 causes). 2  Abnormally curved ends of fingernails and Abnormal fingernail shape (6 causes). 3  Abnormally curved ends of fingernails and Abnormal fingernail shape in adults (6 causes).