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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.
WebMD Symptom Checker. Curved fingernails. WebMD Symptom Checker helps you find the most common symptom combinations and medical conditions related to curved fingernails. Click on the combination that matches your symptoms to find the conditions that may cause these problems. Or click on See All Conditions to see every condition related to curved fingernails.