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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.
Curved fingernails. WebMD Symptom Checker helps you find the most common medical conditions indicated by the symptoms curved fingernails including Chronic obstructive pulmonary disease (COPD), Emphysema, and Interstitial lung disease. There are 3 conditions associated with curved fingernails. The links below will provide you with more detailed information on these medical conditions from the WebMD Symptom Checker and help provide a better understanding of causes and treatment of these related conditions. 1  Chronic obstructive pulmonary disease (COPD).