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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.
The distal part â that's the separation between the white and pink part â has a curved shape. That's creating the stresses, Rauch told Live Science. Eventually, this stress causes the far edge of the nail to poke down into the skin alongside the nail, leading to an ingrown nail, the researchers found. Themedical name for the condition is onychocryptosis. These forces are also the reason that the big toe seems especially prone to ingrown nails, Rauch said.