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1. Respiratory Health Issues. Downward curved fingernails can indicate a problem with respiratory health, and are often present in people who have medical conditions such as COPD, chronic bronchitis, asthma and lung cancer. Fingernails often curve downwards as a result of lack of oxygen.
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).