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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 for different types of dark lines in fingernails. A thin, flimsy nail is also caused by a diet B12 insufficiency. Vertical ridges might be the results of in adequate diet and nutrient absorbency, and even kidney issues. But vertical ridges are very standard of negative circulate in problems such as rheumatoid arthritis.