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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.
Why Do My Fingernails Curl? The appearance of your fingernails can give clues about possible issues with your overall health. If your fingernails are discolored, have horizontal ridges, are pitted, or curve, you may have a medical condition that should be investigated by a doctor. It is also a good idea to contact your doctor if your nails curl outwards, a condition known as koilonychia or spoon nails.