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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.
The thickness of the nail is influenced your genetic makeup, what types of foods you consume, and even the weather. There are a couple lung conditions that cause the finger nails to club.. The nail takes a large curve and the fingers look, in general, bigger and rounder. It is seen in patients with advanced lung cancer or high blood pressure in the lungs. I suggest that you schedule an appointment with your primary care physician.